You can also try the spec of my new DK, I recently got him to 80 and tank off and on when I have time. I have Unholy Blight in my blood spec and seems to work great so far in Heroics, I never had issues with AOE aggro (you still dont have snap like frost but its fine overall) till date.
http://www.wowarmory.com/character-t...mongor&group=2
Rest is your choice rotations remains same, just pop Unholy Blight as soon as you have RP to do it. Quite a few points in Unholy tree are fillers to get to UB so you can move them around if you like.
Be careful this spec is good till 3.2 and I probably will change once 3.2 hits.
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