I'm one of 3 dps DKs in my guild and the other two raid unholy exclusively. I've always enjoyed blood more so I made that my main, and I had unholy as my off. After missing an enhancement shaman for a few raids, I decided to switch my second spec from unholy to DW frost. Now granted, my weapons kinda suck (I have 1 from 10 man heroic toc, but the other is a no stat sword from ony), and my dps is definitely lower than it is when I go blood, but boy if it isn't fun.