Only thing that really bothers me with Kemp is the insane amount of money he wants. He will most likely become the best DT in the league but I mostly prefer 2nd-7th round picks because you can sign them for less. TE Karron Cousins I do draft in the 1st round though because he doesn't demand too much money considering the talent he is at TE.
My favorite DT is Earl Whitaker from draft #26. He has some serious speed for a DT and I think he's available in the top of round 2.