I've never tried to play along with guides so I'm figuring out what's good for Javazons by myself. I'll leave notes down here and edit as an organic way of gathering my thoughts.
Javazons are great because they can rely completely on skills if they needed to. With enough investment in the required skills it's quite possible to do Hell Baal runs with even the crappiest gear bought from a vendor. That being said, Javazons still benefit greatly from equipment, and go from pretty great to god-tier with the right gear. Truly, the party that never ends.
Strength: If you pick your armor and weapons right, you won't need very much here. The highest I can think of is 156 for a monarch, and then you can subtract a whole bunch of points after you get +strength equipment.
Dex: Upped Titan's Revenge is 151 dex (non-upped 109); considering how amazing they are this is good goal to set.
Vit: Everything else.
It's worth pointing out that Akara can reset your stats once per playthrough, so you can always start off dumping everything in vit for survivability and then transfer points over when you find something particularly worthwhile. I wouldn't bother with energy in any case though, since returns are so puny on energy investment you'll be burning through your mana no matter how big your pool is. Just drink mana potions like crazy and you'll be fine; they're cheap.
Prerequisites/utility skills 1 each: Critical Strike, Penetrate, Pierce, Dodge, Evade, Avoid, Jab, Poison Javelin, Plague Javelin. Pierce is the exception: if you want 100% penetration with Razortail, you'll need 9 soft points in Pierce. Depending on your gear you could potentially just put one hard point in here and let your equipment do the rest. Once again, Akara can reset, so put as many here as you want and then reset once you've gotten your endgame equipment. Assuming you have amazing equipment, you're spending 9 points in total in this tree.
Some people are proponents of not putting anything in dodge/evade/avoid, to which I disagree. Those three points, together with soft points, are very well spent here and greatly increase survivability, particularly in hardcore. Otherwise you're gonna eventually be spending those three measly points on synergy skills which provide a relatively small benefit.
Another option is valkyrie, but that's another 4 points at least and potentially 23 if you want to max valkyrie though for the life of me I can't see why: just one point plus equipment makes her nearly invulnerable. Anyway javazons have decent health and tremendous damage output so I don't really think a tank is necessary, but if you are ok with a somewhat weaker charged strike/lightning fury it's not a crime to have a valkyrie.
Charged Strike: 20 points. Max this first. The little lightning bolts can all hit one target and each can potentially do thousands of damage with the right gear and investment. You can kill nearly any boss in seconds even on 8 player hell runs.
Lightning Fury: 20 pointsMax this second. Insanely good crowd control spell even if it is weaker per bolt and more expensive than charged strike. Together with pierce, the javelin pierces and activates all the bolts again and again as it passes through each victim, and naturally the bolts pierce everything too; this skill actually gets better the larger the group of enemies you're fighting.
Power Strike, Lightning Bolt, Lightning Strike: 60 points. Max these after Charged Strike and Lightning Fury. They all confer the exact same bonuses to charged strike and lightning fury so it doesn't matter which ones you put points in.
Total is 109 points (out of 110 from levels and quests). You'll probably never get there, but it's nice knowing that your character will always actually noticeably improve with each level (unlike, say, bowzons who essentially plateau after level 50).
Gear: Will list best equipment first, followed by some good but cheaper options, followed by interesting options. Generally what you want is +skills, resistances, mana, life, IAS, FR/W. Resistances are less essential than for, say, a barbarian since you will be doing a lot of your damage from a good distance, but you'll still be going for the throat sometimes. Lightning resist is most important; poison least. Crushing Blow and Deadly Strike are often overlooked in this class, but they're certainly useful for those rare instances where you stumble upon lightning immunes. The most important in terms of lightning damage output is the rare but coveted -enemy lightning resist mod, which is only available on a few items.
Aim for 52% IAS. It's the second highest break point for lightning fury and 50% is the second highest for charged strike. The NEXT breakpoint's at like 90% IAS, and that's frankly silly unless you're playing with a pally using Fanaticism. An easy (albeit expensive) way to get around this is to give an act 1 merc the Faith rune word, though you're missing on the good auras Act II ones could potentially give.
- Griffon's Eye: The increase to lightning skill damage is what you want. For the absolute best, socket with perfect lightning facet. Both items are rare as hell though. Ladder only.
- Harlequin Crest: Huge bonus to life, mana, and +2 skills. Need I say more?
- Crown of Ages: socket, skills, resistances. Amazing.
- Kira's Guardian: a potential +70 to all resistances, as well as the cannot be frozen attribute, frees up a LOT of your equipment and a ring slot if you were using raven frost before. This helm doesn't give much else but essentially lets you be a lot more flexible with your other gear.
- Andariel's Visage: +2 skills, +20% IAS, high poison resists. The loss of fire resist is painful though. Also, your character will look hideous.
- Valkyrie Wing: +2 skills (potentially), FR/W, +mana per kill will help you stay in fights longer if you find yourself constantly dry.
- A rare/magical circlet with +2/3 skills, IAS, and more...circlets can potentially be amazing for anything.
- Rockstopper: Amazing defensive boosts. Upgrade it for even better.
- M'avina's True Sight: 30% IAS.
- Peasant Crown: essentially a poor man's harlequin.
- Lore (Ort+Sol): easy to make, good modifiers.
- Radiance (Nef+Sol+Ith): cheap, nice defensive modifiers.
- Tarnhelm: dirt cheap and common as hell with practically no requirements, but with a nice +1 skill and magic find. A great starter helm.
I'm missing a few...as long as they have one of the traits I listed at the top they can be good.
- Chains of Honor: Needs no introduction. The ridiculously pricey runes makes this item wistful thinking for any but the wealthy and lucky.
- Enigma: Again, needs no introduction, and again, ridiculously expensive. I consider CoH to be better because of better resistances and javazon's good speed with Titan's Revenge already.
- Treachery: This armor has no business being this good considering how cheap its runes are. The Fade gives you a massive bonus to resist and damage reduction when activated and the massive +45 IAS is unmatched. Unfortunately nothing else it gives is that remarkable. The Lem rune is semi-rare but you can still get it after grinding the Countess for a few dozen runs, unlike the Guls and Ums and Ists out there which can have you farming for so long you sink into an existential crisis. Even if you don't want to wear this permanently the fat +60 resist and +15 phys damage reduction for five minutes you get from activating fade is certainly nothing to sneeze at; keep one in your stash and you save yourself considerable pain.
- Duress: Cheaper than Enigma or Chains of Honor, but with decent modifiers nonetheless.
- Peace: cheap, +2 skills. Don't bother waiting for a perfect armor to create this with. The other skills are good too: an extra tank in the form of a Valk is certainly better than not having a tank, and slow missiles can at most save your life and at least provide a good laugh.
- Ormus' Robes: lightning skill increase, but it's hard to find and javazons can't take full advantage of it.
- Rattlecage: I stumbled upon this in normal. Crushing blow and monster flee can be very useful in the early game.
- If you're REALLY nuts, a Jeweler's Monarch of Deflecting filled with lightning facets is the absolute best possible, but good luck getting that without sinking a decade's worth of play time into the game.
- Stormshield: 35% damage reduction, some other good ones. Can be socketed for more. Stormshield's +35 phys reduction stacks nicely with Treachery's to give you the maximum possible of 50%.
- Spirit: Everyone's favorite. Best shield to go with a CtA.
- Phoenix: constant mana and hp refills from redemption, some other good modifiers. Costs an arm and a leg.
- Rhyme: Cheap and good.
- Sigon's Guard: I keep finding these things. The +1 to skills and the low level requirement make it a nice starter, even if it slows you down.
- Ancient's Pledge: if your resistances suck and you find yourself getting constantly one shot by gloams, there's not too much shame in lugging one of these around.
- Titan's Revenge: plus to skills, FR/W, replenishes quantity, +strength and dex (sparing more points to vit). You can upgrade it to have a bit more physical damage oomph but the dex requirements will be raised considerably.
- Thunderstroke: this objectively has the potential to do more damage than Titan's, also with 15% IAS which Titan's Revenge doesn't have. However it doesn't replenish quantity and lacks some of the stats that makes Titan's Revenge so attractive.
- A +6 to Javelin/Spear, IAS matriarchal javelin. There's no reason to assume these can't exist but I've never seen one.
- Any amazon javelin with +javelin skills is good until you can find something better. Leech and IAS are particularly useful.
- (Offhand): Call to Arms, for Battle Command and Orders. Any weapon will do since you'll probably not be using it for actual fighting.
- Conceivably you can craft gloves with crushing blow, +javelin skills, leech, +str/dex and/or IAS. I actually have quite a good pair with these exact modifiers, but I was very, very lucky. Regardless crushing blow is a guarantee which will speed up killing lightning immunes quite a bit. Just save nef runes, rubies, and jewels as a matter of habit and cube any sharkskin gloves you find; you never know if you might get lucky. The best level to cube blood gloves, by the way, is about 72-76...or so I've heard.
- Lancer's gloves of alacrity: +3 jav skills, 20% IAS.
- Lava Gout: 20% IAS, fire damage will help a lot when dealing with phys/lightning immunes.
- Laying of Hands: IAS, resists, demon damage.
- Razortail: This allows you to bring pierce up to very high levels, since it stacks with your skill. At ridiculously high levels of Pierce you're hitting near 90% pierce anyway (85% with 25 pierce), so if you have a very large amount of +skill items this belt may be made somewhat redundant. It all depends on how badly you want 100% pierce.
- Thundergod's Vigor: lightning damage. An extremely powerful but rare choice with a bunch of other highly helpful modifiers. Contends with Razortail for the best belt for a Javazon.
- Arachnid Mesh: the only belt with +1 skills.
- Verdungo's Hearty Cord: a massive bonus to life, damage reduction, one of the best belts in terms of defense too. Javazons are pretty squishy for an in-your-face class so this belt is pretty damn useful.
- Goldwrap: 10% IAS, magic find.
- Gore Rider: the boost to run walk's not the best in class but it's certainly not bad. The bonuses to crushing blow (particularly if using crafted gloves) deadly strike and open wounds make the amazon's physical damage much more potent, especially when used with Jab. With an attack speed this fast you're bound to activate something.
- Sandstorm Trek: Many I know swear by these. I don't see the appeal. The only thing that stands out to me over other boots is the high poison resist, but poison's frankly not that dangerous in PvM. I'm putting this here out of obligation.
- Sander's Riprap: I keep finding these so either I'm very lucky or they're very common. Their near non-existent requirements, together with +40% FR/W, make them very handy in the early game and maybe later.
- Waterwalk: another common early pair, with a nice boost to life, speed, stamina.
There a bunch of set boots which are all excellent, but very rare. Natalya's and Aldur's come to mind.
- Stone of Jordan: Needs no introduction.
- Raven Frost: Cannot be Frozen can be invaluable. The rest of the modifiers are nice, too, for such a mana hungry class.
- Bul-Kathos' Wedding Band: a physical variant of SoJ. Good if you can't find SoJ/already have cannot be frozen.
- Anything with plus to life or mana, leech (for jabbing), and resistances can be nice.
The very best amulets differ wildly in their abilities. Tailor these to what you are lacking.
- Highlord's Wrath: Depending on the rest of your gear, this may be the best for you. IAS and increased chance of deadly strike are what stands out. People call this nooby but I like the extra power to lightning immunes, and the bigger plus skills other ammies have are nice, but not mandatory if you've been lucky (or rich) enough to get the better stuff earlier on the list.
- Mara's Kaleidoscope: As simple as it is useful: big stat boosts, +2 all skills, +all resistances. Great for any class, frankly.
- The Cat's Eye: FR/W, IAS, defense, and a nice big bonus to dex.
- Rare, crafted or magical amulet with +amazon skills, hp/mana, and/or resists. These have the potential to be extremely good.
- The Eye of Etlich (Diablo II): +1 to all skills, low requirements.
- General consensus is that Andy's Visage is the best merc helm. However, my merc's top cause of death even without it are those stupid hydras from those council members. It's a good enough helm socketed with fire resistance, perhaps.
- Rockstopper: as mentioned above, great defensive properties, and your merc's primary reasons are to be a distraction and give a useful aura, so...
- Guillame's Face: crushing blow.
- Treachery: some guy had done a detailed calculation and came to the conclusion that Treachery is better than Fortitude, so there.
- Fortitude: If you somehow for the runes for this but NOT Treachery, certainly not bad.
- Skullder's Ire: for the greedy little piggies out there. Let your merc land the killing blow for the MF to kick in.
- Infinity: hard as holy hell to make, but grants CONVICTION, which makes the game go from easy mode to stupid easy moode.
- Insight: A very cheap, very useful polearm which gives you meditation, pretty much ending all your mana problems. Don't be afraid to make this on a cheap, early polearm.