Titans is a luxury, not necessary at all to make a successful javazon. Out of the 5 or more javazons I've ever made, only 1 ever had titans (softcore zon finally got them).
Synergies aren't necessary either.
You will get the most bang for your buck out of lightning fury by maxing pierce. Many people stop at about 10-12 points in pierce. I max it, but ignore the synergies for LF.
I'd like to compare damage output of a max pierce javazon vs a max synergy javazon with only a few points in pierce. I think the max pierce javazon would win, esp if she knows how to gather monsters.
In 1.10 it has become a good option to boost Valk to lvl 17 where she spawns with a warpike, and can almost do as much damage as your merc.
So if you want the most points available to spend on the options, put 20 in LF, 17 in valk, and 10+ in pierce (max is best). Thats less than 60 points giving you the option of going hybrid (bow skills) or boosting dodge, etc.
My equipment (lvl 86 javazon ladder):
Awesome rare circlet +1 skills, 15 resist all, 30 life, 30 Fast R/W - topazed.
110 dmg ceremonial javs with 6% mana steal and replenish
Rhyme grim sheild
Everything else MF with some resists (gloves, boots, rings, ammy).
Armor is 4 topaz 450 def - i used to use 800 def smoke but don't need it anymore.
I have max resists in hell (with charms) and about 250-300 MF. No group of 3 or more non-LI monsters takes more than 5 or 6 throws to wipe out in a 2-player game (I have a BO barb I sit in game with). In larger packs, of course they all die in one or two throws (the power of pierce + lots of enemies).
My merc and valk take out immunes fairly quickly and effectively, esp if I help them with slow missles against the archers.
I have low dex at 109 (just enough to equip my ceremonial javs with items). Before that I had about 50 dex. About 111 str with items (for my armor). Everything else vit.