Fire & Ice & Teleport!!
Man, I though disintegrate was awesome, then I hit Act 3 Hell and was like... man I hope I don't have to have 200,000,000 G worth of gear to finish this game. So I tried living lightning build, I tried including energy armor... all lame.
So I made a fire & ice build. Nothing but pure dps. Wow does it ever feel like I hit like a truck. Hell mode hammers guys were basically destroyed in about 3 seconds, and Act 3 & 4 bosses were melting in battle which took under a minute. I feel like a mage!! Sure I can't take much for hits, but neither can the elites. Most of the time, if I need to bust out frost nova, I just %#*# down the mob point blank, because he'll be dead before it expires. And lastly, I'm quite happy to say, that despite not including a signature spell, I never run out of mana. I do have a piece of gear that gives me back 10AP on crits... and as it stands, I can shoot RoF infinitely if I'm hitting targets.
ANNNNND boom goes the dynamite.