The build with the highest Dps is currently
http://hellgateaus.net/planner/#Evoker,55,50,1,0000100000009060033900000090033000,000000000000000It leaves you with 11 skills to build with, usually with increasing swarm, increasing the drains, maxing spectral curse, etc.
some Notes like others, Farm your Balbi's easiest current way is level 24~26 area's in hell mode killing the messengers (maximize your luck if possible it does have some effect, less blues and green's). A clean veiled is really only gonna between 20~50 k on any given day.
#1 Avoid at all possible spending hard points into stats to equip armor gear excluding babli's and Veiled. Grab some Foci that provide +6 total venom armor and +5 elemental drain these will be a gear swap and should stay with you till end game.
#2 when you can gear with bottemless prism's mod them with blue elemental damage relic's they get pretty nasty quickly and should hold you over until you get the Forbidden core blueprints (36~50). Not only do the mods keep you in line with will feed they can be a good weapon until after astaroth.
#3 Eventually you should plan on going full critical build, which means getting some nice early masterful lens gear for demon's or spectral's to build up your exp in Stonehenge area's.
#4 your final gear for a full critical build will be a mix of set and unique gear. Plan on Velied, Babli's, Set shoulders, torso, and shoes. That leaves you with finding some really good gloves and legs. FYI the Franzberg salwars offer the same stats as the set legs with lower feed costs. Gloves should have shield penetration and increased use rate (+16~18%).
You should find that demonspine will be ok for everything until flameshards. Once you have flameshards +demonspine combo you should really start cooking damage wise.
It's a shame that lighting was nerfed so much, spectral requires heavy, heavy investment to be ok, Poison has high cooldown time, all this means that fire+bone build is the most effective build there can currently be.