In mob all the talents have a increase to damage somewhere, Trolls:Beserking, Orcs:Pet Dmg, Goblins:1% Haste ect...
I personally like blood Elf priest, but since i want to min max for progression think it would be to OP to have Arcane Torrent give a Shadow Orb since it restores resources from energy to Dk Runic power and Energy?