I say 4th round. There are a lot of injury prone backs (e.g. McLendon) AND undersized backs (e.g. Sproles), so after you get past the first 6 or 7 RBs, it's a toss-up. MoC has the biggest upside of all of them, he's a proven, punishing back, and while he might have some rust from being off the field for two years, his body should be in great shape since he hasn't taken any hits either. There are a number of teams that could take two RBs this year -- teams that need to spend their 1st pick on a feature back and a later pick on a 3rd down back or insurance policy. To me, MoC is a perfect fit there, and will get a good long look from several teams.