If Crean were to leave his position as head coach, I think you have to pony up and get the number one guy on your list. Make it where he can't say no. If you have boosters willing to pay 12.5 million for a buyout, surely those same boosters would pay top dollar to retain a great coach. Heck, I would help raise the money myself for the right hire.
Edit: I think Crean is back next year.