I believe that the Bills didn't go after one of the big name QB's was for a couple of reasons...
1) Both McCoy and Clausen had too many injury concerns.
2) If rookie salaries are suppose to be much lower next year why not wait a year and maybe sign a guy for much less instead of spending a bunch of money on someone who may not work out. What if Levi Brown is a great NFL QB? Then we got him for a great deal.
Spiller is gonna be a great NFL player, no question in my mind. Bills made a quality pick taking him ninth, next draft when we do sign a good QB (if no one steps up this year) then we will have a good young QB and a great young running back for years to come.