hopefully this will give you some ideas among the rookie class
a few guys from the list that dont have the mitchell like hype:
robert mccune, WAS - long term MLB is wide open in washington. i think he has trotter-upside.
jordan beck, ATL - long term MLB/WLB is blocked by hartwell and brooking, but i think beck has one of those spots in 2-3 years.
michael boley, ATL - same as beck, but only a WLB.
leroy hill, SEA - quietly playing well and getting reps at #1 WLB for seattle with DD lewis hurt again before tweaking his knee.
sean considine, PHI - set up to be the heir to dawkins
goo wallace, PIT - #1 backup ILB for pittsburgh, and will get every shot to beat out foote eventually.
alfred fincher, NO - stuck behind watson for now and still has work to do before he can be a first teamer, but like mccune, projects well as a tough SOB of a MLB.
brodney pool, CLE - stuck at 4 on the safety depth chart, but should be starting in 2 years at latest. projects to be a "QB of the defense" kind of safety.