curteric,
What State are you going to be hunting in? Some States have caliber restrictions, ignition restrictions, bullet restrictions, powder restrictions, and other restrictions. I would start by getting a big game hunting handbook, or going to their web site and looking up the regulations. If you can use a scope, I think we can safely eliminate some States from the equation.
What type of action do you like? Bolt, break (tip-up), drop block, rolling block, plunger action, or side hammer. The biggest determining factor will be what type of ignition they allow. You don't want to buy a rifle that would not be allowed. Make sure of the regulations before buying. Get back with us and we can get you pointed in the right direction. Lots of really good muzzleloaders can be had at very good prices this time of year. If you decide what you might want, let us know and someone will know where you can get the best buy.
This is a link to R & R. You can search by brand and caliber, saves some time.
http://www.rrarms.com/catalog.php?action=1004