Suh will be #1 or #2 overall, so I doubt that the Bills will have a shot at him. Buffalo had better not take a QB either, unless they want another one to get his butt kicked and lose his confidence behind a poor OL. The pick HAS to be OL. From what I read, the best is OT Russell Okung from OK State. Several preliminary mock drafts have TB taking him, if they finish worse than the Bills, but he would be the guy to target even if Buffalo has to move up a spot or two.
BTW- If the Bills finish so badly that they draft #1 or #2 and Suh is available, they should absolutely take him. Take the best available player in the #1 or #2 spots regardless of position and Suh is the guy.