Yes I considered doing prot pally for AOE tanking + Frost mage for blizzard, but that means too much mouse-targeting. I have 2 monitors, but still I need to move my mouse here and there, and it gets kinda overwhelming for a new dual-boxer like me =)

I think I'd try prot pally + arcane explosion spam then. For single mob, I'll try spamming fireball.

Thanks all for the suggestions.