You are almost always better off get your tickets as late as your nerves allow for. I would say always, but the crazy run on tickets for Auburn-Oregon in 2010/11 is the only qualification, and that won't happen this year.
The most expensive ticket as far as Alabama fans would be concerned is probably Bama-FSU. Ohio St and Stanford (because of location) would be close, but ignore all of this if it is Baylor because those tickets would be nothing.
Right after this game is set, endzone tickets will probably be near $800-1,000. Once all of the tickets start getting mailed out by the schools and the bowl itself for those that have team ticket reservations, the prices will start to fall. If you can bring yourself to wait until 7-10 days before the game, you can get a great deal. I remember multiple people outside of the Rose Bowl against Texas trying to sell their extras for face value and getting no takers. The reason for that is no one is going to travel that far and not have a ticket.
Good luck in your hunt, but don't buy anything before Christmas.