I'll be surprised, shocked, flabbergasted, and dumbfounded to see Dallas select any RB in round 1 unless we let Barber walk and draft DMac or Jonathan Stewart. These other guys are not franchise RBs and you'd be crazy to select any of them in round 1.
We are in desperate need at CB, WR.
We can improve our starters/rotations at LG, ILB, FB, NT, S...I say NT because I really think we'll improve at DE by moving Ratliff there next year.
We may need more depth at QB, OLB...OLB is assuming Ellis leaves.
We definitely need role players to improve at Special Teams, punt return.
If we resign MBIII, I don't see any way in the world we'll tie up money and a first round draft pick on a change of pace back, no matter how good he is. I think we definitely take:
CB, WR/NT/ILB/NT in round 1 or
CB & trade down into round 2 with the later pick.