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Mages, if they don't suck, should be doing 7-9K DpS on Heroic bosses and at least 5-6K on the smaller trash pulls. Even perfectly played, a DK won't beat that. HB, BB and diseases don't beat FSs and Blizzard. And Mages have CDs that let their single target DpS skyrocket on short fights, where DKs don't.
I normally agree with you on most things dig, but here I don't.
Heroic boss is a short fight, generally around a minute long. If as frost you use your BT/UA macro like you should you're getting 20% more strength for 33% of the fight (20 seconds).
As for the whole aoe thing in a heroic a frost dk pending on KM procs should beat mages. Basic intro to a good aoe pull is....
IT > PS > Pest > BB (to increase chances for KM proc) > HB > Blood Tap > BB
If you manage a KM proc you're going to outdps most anyone in a heroic, barring warriors who know what cleave, sweeping strikes and whirlwind are.
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ArP is loopy enough to also be good for Unholy and Frost after a while so if you had the passive ArP to make Blood sexy, it would make Frost or Unholy even sexier.
If you end up with near 90% arp as frost you switch to sigil of awareness for massive oblit. You're single target dps is pretty close to insanity while your aoe is going to suffer from lack of strength:ap conversion.