Some important things to consider are the game regulations in your area.Some states dont permit 209 primers ,closed breech designs etc and these will restrict your choices considerably if you plan to hunt strictly in the primative/muzzleloader season.If you use it for regular season then its less of an issue. A good choice for just about anywhere are the striker fied inlines( T/C Black Diamond,Knight wolverine/American, CVA 's of various models etc.Because these designs are no longer " cutting edge" , they are generally inexpensive.They are alittle more labor intensive regarding cleaning and they can be hard on scope finishes, but its not a big issue.I retired my Omega in favor of a Black Diamond XR .50 cal and have not regretted the choice for a second.The BD is superbly accurate , utterly reliable and anywhere I can hunt with an inline I can take the Black Diamond.One thing though, unless you know what you're looking for , or know someone who's very familar with muzzleloaders/inlines, I STRONGLY urge you to avoid used muzzleloaders.There can be issues such as worn muzzles,corrosion from improper( or lack of) cleaning,frozen breech plugs and more.Best to get a new rifle ( and warranty) and avoid the headaches.The Knight American is an excellent rifle ( alittle short barrelled for my taste..).The T/C black Diamond ( regular or the longer barrelled XR) is no longer in production but can still be found new in box ( NIB) with alittle careful snooping an I HIGHLY recommend it.Another not often mentioned advantage of the striker fired models over the drop block/break open designs are their full length rammers.With the full lenght you have a stronger rammer for tight loads and for the occasions you have to pull a charge its infinately superior to the telescoping rods found on some break opens and not having to pack a rammer extension( which you will need to load and swab between shots)is also nice. Best of luck