Inferno Diablo Phase II:
A3 Elite Packs:
This was essentially the build I had been using up until I got to inferno, but had to abandon it pre 1.0.4. However, post patch with several upgrades and pet buffs its now extremely viable.
Spirit Vessel and Blood Ritual are permanent. For the last slot I tend to use one of the following: Jungle Fortitude, Pierce the Veil or Fierce Loyalty. For an Act IV clear Jungle Fortitude works best.
Blood Ritual, a helm with Mana Regen, Firebat cost reduction along with a slow hard hitting 2H allows a GotD (groping eels) and bat spam mobs to death.
I've tried all kinds of combinations and this is definitely the one that makes ACT IV easy mode. Give it a try and enjoy!