DRK, BLM, BRD, AST - nothing could go wrong here. DRK can never loose agro unless he runs out of mana (which can only happen if there is stupid WHM who uses holy all the time - specially during blood price). Both AoE and single target dmg of BLM and BRD is incredibly powerfull (combined with foes requiem). And AST with proper cards... one can only dream.