I was thinking
20 mage
20 skel mast
20 fire golem
10 in lower resist \ CE (maxing CE slowly as I level)
1 in everything else except bone spear\spirit, dim vision, confuse, attract and revive.
I would get 1 in poison nova and spam a lot of bonewalls\prisons\novas while the slow slow deaths of enemies happens
I don't know about act3 merc, but perhaps.
I really like insight merc ~_~