Everybody has this hard on for Willis, and I agree I think he'd be a great pick for the Bills. That being said I think Poz would be just as good for the Bills. The guy was a hell of a LB, is fast, has good latteral movement, is pretty good in coverage and is a tackling machine. As long as Crowell can successfully make the transition to MLB (or the Bills could take someone like Beason in the 2nd round) I think Poz works just as well for this team and gives them the potential to pick up more picks by moving down in the draft to get him (though I'm not really sure if Marv is that interested in trying to milk the draft for all it's worth in terms of trading down). I really wouldn't mind seeing the Bills draft LBs in the first and second rounds as long as there are players there that fit the bill.
As for RBs, there are so few teams that need RBs it's going to push some good RBs down in the draft and enable the Bills to pick one up later on day one. I wouldn't mind the Bills waiting until round 3 to draft a RB (like Pittman).