That's a tough poll to choose from. I think the real question you're getting at is what high-priced FAs the Bills should get?
Looking at their RFAs, they have the following coming up:
Hughes $4m
Pears $3.45
Spikes $3.25
Searcy $1.55
Hairston $0.75m
Easely $0.73m
Wynn $0.64m
L. Smith $0.68
Among the bottom 4, they will probably sign 6-8 with minimal raises for 6 and 7. I think Hairston will probably receive an offer more than what the Bills would like to pay him.
For the top 4, Searcy will be signed with a nice little raise. The key decision will most likely be not signing Spikes, then use that money to pay Hughes. They should also let Pears go and sign a real guard for his $3+mil. That strategy gives them a lot to work with because there's no dent in the projected cap space (I think $17 mil was projected?). Ditto with the swap of Pears for a FA guard. At this point, you've got your defense essentially intact, and your starting Oline. This leaves the Bills with a lot of money to fill any other holes--like a TE, or if they want to bring another QB in?
Hmmm...Freudian slip leaving out Spiller?