Sorry I missed this earlier but if your going PvM why not to a dual elemental build.
I wrote a guide for one a few weeks ago its on this forum and the revised copy for single player is on the SPF forum.
Its a really nice build to play it's easy and effective from the get go, especially the hybrid with oak sage and summons. you can get 1000 in 4 damage sources covering 3 damage types which is plenty to PvM through Hell.
Mmine is only in act 4 Hell but I don't get to play that much anymore only like 5 hours per week max. It's only issue is life when playing pure elemental tree but with the hybrid that becomes a minor issue it is very Hell viable, the only catch is you have to have a stone runeword, so any other armor is moot.
Edit: it was a bit further than I expected back on the pages heres a link:
[thread=292364]Dual elemental guide[/thread]