Mages, at 85, how would a 5 mage setup work for pvp?

[Pycno]

I had 4 mages and 1 priest since TBC. It was strong in TBC, even stronger in Wotlk, ridicilous in cataclysm. I did not level them past 80 but I think they would become much stronger at max level with good items.

I didnt bother much with arena, I prefer challenges in games not based upon grinding. My highest rating was 1600, tactic was to use everything I had and either win/lose within a few seconds. I used fire spec because of the massive aoe.