theox mentioned the best units. If you're looking at the possiblity of the late rifle, it seems like bigger bulls come off the beaver unit on the late hunt than the early.
I'd decide when you want to hunt, with possible changes to seasons, next year is really the only year that you know for sure when you would be able to hunt. If you want to hunt a bull during the rut for sure with a rifle, I'd suggest you get one while you can next year, even on a lesser unit.
There's some good guys on this site that will help you out, especially if you have something in return for them (hunting in your area or $$$, whatever)
of those units that you could probably draw I would go for either wasatch, manti, or the deep creeks.