For my mages i was full arcane and used pitbulls buff frame to display missile barrage procs so I could use them individually on each of my 3 mages. Doing this I have managed to get as high as 3x 6000+ DPS on a heroic boss wearing almost half blues half heroic/naxx boe epics. Granted that was before 3.1, I never even downloaded the last patch to see what I'd do now.