For deathknight this so far is the strangest build i've ever seen.
its not a tanking nor dps spec, seeing your gear i'd say your a dps but why do you have a deep unholy spec?
you're missing a lot of dps that way and kind of gives the idea that you don't really know what you're doing
however you do have unholy 25 man in ICC wich makes me think how you got that far with a spec like that
you can also work a bit more on the gemming.
Rather have somebody that got a good spec and only chooses gear for the GS instead of the dps you can do with it so for the deathknight its a no for me
dythor will handle the mage