Both the above are abosolutly correct but going:

Prot Pal
3 X Arcane Mage
1 X "holy nova / mass dispel" prist build : http://www.wowhead.com/?talent#bEhMh...t0bbVV0h:VRZcM

is best for multiboxing aoe (mass dispel for pvp).


Probably a shaman with magma totem / thunderstorm would work instead of another mage. But over a short term the mages can do more aoe damage with arcane explosion