While I wouldve said Jones or McCoy earlier in the year, I think at this point you have to mention Bradshaw as a legit candidate as the best in the division.
He's playing behind poor run blocking, and is 3rd in the league in yards. Ahead of guys like Adrian Peterson. That has to count for something.
He's not the fastest RB in our division, he's not the strongest, but the guy just gets it done. And he's not the product of a good oline either, he's doing it mostly on his own.