I share your opinion of Bulaga and would also like to trade down for Cody, but I just don't think we'll find a trade partner. Some team wanting Spiller seems like the only outside chance at a trade down scenario. The general consensus is that this draft class is deep, but not top-heavy in terms of talent. The best value will be in the bottom half of round one, and then continue into round two (as is often the case).
The Bills will just have to stick at nine and select the best player available at a need position. It could very well be Dan Williams. If I had to guess, Derrick Morgan would be the other possibility. OLB isn't as big a need as NT, but I believe Morgan to be the better player and best player that will be available besides Spiller.