The spec my mage is using: http://www.wowarmory.com/character-t...uclear&gn=Myst

You should understand that the 3700 dps is with all cooldowns popped +heroism. My mage seems to benefit much more than my other toons from the added haste. I do hold open the possibility that I'm missing something as well. My druid hit 2800 on boss today with heroism.

The mages spell rotation is basically /castsequence reset=combat/target/5 [nochanneling:arcane missiles] Arcane Blast, Arcane Blast, Arcane Blast, Arcane Missiles, Arcan Barrage

I may actually do more dps without the missiles, but I haven't checked.

when i pop heroism I use (from memory) the following:

/use 13
/use 14
/cast Mirror Image
/cast Arcane Power (is that the right name? can't remember)
/cast Icy Veins

all of that together puts a lot of pain on