One that you feel is good, or one the Bills feel is good (and you are not so high on.)? 
If they get one you feel is good, can you tolerate watching him sitting on the bench for 1-2 years while Fitz starts? 
Or are you going to demand they get rid Fitz, find a veteran back up, and force the rook into the starting lineup? 
And if the rook becomes a bust 3-4 years later, will you stand up and say, "Well, at least they tried" or will you continue to B word and moan about the Bills not having a good one?