With 3 mages I like frost. I only spam 1 dps attack and just pop my cooldowns/elementals. No need to watch for procs. Maybe I could do alittle more dps but I dont think it's worth giving up the ease of frost dps. Spamming 1 button which is also my tanks sequence makes life easy doing heroics. The only other buttons I need are cooldown/elemental and my healing buttons.