respec my mages to arcane and have not noticed much dps increase on the target dummy. I am using this macro.

stopmacro [channeling]
/cast icy veins
/cast arcane power
/cast presence of mind
/castsequence [target=focustarget,harm] [] reset=target/combat arcane blast, arcane blast,arcane blast, arcane missiles

I will test it in heroics thursday. I am thinking frost is better because the elementals do damage while I am running around.