So with everything totaled you are looking at $330-$360 (Uncle Sam is never far away with his hand out) Not TOOOO awful bad a price. I personally would go with a bare primer option myself. If you wanted to go with a FPJ then I personally would opt to spend a couple hundred more and just get a brand spanking new Disc Extreme. I would also probably opt for the new (newer) .52 caliber option as well. Granted Knight holds the patent on the sabots right now and they are the only suppliers of them but that may not last much longer. I think that .52 is starting to catch on a bit well and they may start licensing options to MMP or Harvester to market them under their own branding. Could be a good option for you.
You can go here you look, under the caliber tab click onto the .52 caliber and you will see that it's only $398
http://www.knightrifles.com/product/...-muzzleloader/