Martin I do like a lot and think he is one of the safest picks in the draft. I agree with Mayok, that's he probably a good LT, but kick him inside and he is an All-Pro LG. Not a fan of Lewan or Moses. After Martin Antonio Richardson would be my next OT on the board and he will be a second round guy. The two tackles I really like are James Hurst and Joel Botonio. Hurst is probably a 4th - 5th round due to his injury, and Bitonio will probably kick inside to guard and go in the third round.
For DT in round one I like Donald, Jernigan and Hageman in the mid to late first round. I think Nix is a top 15 pick. In round two I like Will Sutton, DaQuan Jones, and Kelcy Charles.
To answer, yes the DT's have more value there than the OT's IMO