This build will allow you to have UNLIMITED channeling of disintegrate. Literally can stand in town and channel with NO loss of arcane power. Using my gears and build i farm mp8 for exp and i can stand in mp10 ghom's face without moving and have him killed in about 51secs.
I usually run mp10 keeps3/2 or Vota using chaos nexus for aoe, teleport for fast movement. storm armor for my #2 damage dealer and power of the storm rune so i never use any of my arcane power. sparkflint and force weapon for enhancing my beams dmg. mirrors/mocking so i dont have to stop channeling for frozen elites and can just pop out of being frozen when that happens, and they stun which couple'd with illusionist stuns alot while i stand in the middle of everything.
passives: blur(GC)/illusionist/temp flux
blur: i never want to move so having the dmg reduction if enemies can get to me helps so i never have to move. also a HUGE help for RD elites, arcane beams and mortar. (Glass cannon can work here but you'll want 400k+ ehp plus 300k+[not including soj] dps and 5.5%+ LS. At that point your heal through almost ALL incoming dmg as long as you do not panic and continue to channel.)
illusionist: for cd on teleport and mirrors
temp flux: slows enemies coming at me and with chaos nexus everything is slowed giving me all the time in the world i need to kill them.
Tals' 4 piece set will be needed for the +2 arcane power/sec. i dont want to waste passive on astral pres (WH/Mempo offers attack speed so when using zero apoc they actually hinder my dps as i run out of AP using them)
using a tals ammy with +dmg helps ALOT
Skorn: life steal (5.5%+ LS) and dmg (1400+) is huge for beam and thunders. also the slow weapon dmg is needed to not use my arcane power resource. I found since this setup uses less than 50% cc so i soc weapon with dmg (red) gem.
SOJ: must have -5dis to avoid using any of the arcane power
Lacunis: movement speed
Zuni ring (+dmg/6cc u dont want AS here because u get it on gloves/armor/bracers and u do not want to exceed 1.3AS on all gears) and zuni boots (8%-150+int-high vit+armor)
pants: rares with high int/vit/allres/armor
gloves: i have a pair of crafted 227int/9ias/31cd/10cc but depending on play ill use my t&t 9as/73allres/10cc. the difference is 30k dmg. although using t&t with blur passive i never have to move
With Enchantress buff and my attack speed, with this gear setup i can push ias to 1.3 max to not use ANY AP. anything above seems to drain it.
thoughts/questions appreciated, thanks
Update: using same skills but switching MW rune to blood and utilizing chants set ( 2.7%+ LS chant wand needed)also works. U must be hitting something and with 18+apoc u will never run out of ap. sheet dps much lower but with the attack speed there are more ticks of dis.