I'm also going to refer you to the Lyman Great Plains or Trade rifle.
Stay away from the Cabela's junk and T/C.
Do you want a Pennsylvania rifle or a smoothbore?
Custom guns can be had for $1000.00.
There are numerous new builders who don't charge high dollars for their guns.
If there is any way that you can go to this place:
http://dixonmuzzleloading.com/
you will find about 30 or so custom guns to choose from in addition to the Lyman-type guns.