1st off, Hello and Welcome to Graybeards....
Thompson Center FireHawk Muzzleloader, (DISCONTINUED) in-line ignition, It has a 24-inch barrel, walnut or Rynite stock and blued or stainless steel construction.
Also from T/C the ThunderHawk,(DISCONTINUED) a modem muzzleloader with a bolt-action style breech and other modern appointments including sights and safety, plus it's drilled and tapped for scope mounting. It's available in .50 and .54 caliber with a 21- or 24-inch free-floated barrel.
Here are some pictures of them.
http://www.gunsamerica.com/2550/2550-random-1.htmWolverine 209
(DISCONTINUED), Bighorn took its place - The Knight Wolverine 209 muzzleloader, has proven itself as one of the best deep woods muzzleloading rifles around. .50 caliber Wolverine 209 available with 22" or 26" rifle barrels. A .45 caliber model, with a 26" rifle barrel. The .45 caliber version features a lighter contoured barrel and a pull-style hammer, it's a 1/2 lb. lighter than its .50 caliber brother. here is a picture.
http://www.wholesalehunter.com/product/modern/moddes/wolverine209.htmKnight still makes this but only in a .50 cal
youth package.
Of the 3 you mention I would go with the Wolverine. But thats me I have always been a Knight rifle guy. I shoot a .50 cal Knight Disc Elite.