Slunger,
It really depends upon what you are looking for. Are you wanting to go the "classical" route with a sidelock percussion or flintlock or are you looking at the modern in-lines?
If you're the "sidewinder" type, Lyman makes a couple of excellent models to choose from. If you want to go with the modern in-lines............well the sky is the limit! <img src=icon_smile_big.gif border=0 align=middle>
All the major manufacturers make some quality in-line shootin' irons. There are many models from makes like CVA, Thompson Center, Traditions, Knight (my personal favorite), Remington, White, Austin/Hallock, White, Markesbury, and Savage even has a model that shoots regular smokeless powder. And just about any of these will serve you well for a number of years.
Everybody has there own personal favorites. My advice would be to read the answers you get here and then go to a shop and handle all the weapons that you can. To be honest, feel and trust in a particular brand - may be the best deciding factor you will find.
Oh, if you're the type that likes to be a little different in their tastes, you might even consider this model:
http://www.prabullpup.com/Bullpup2.html
It's an interesting piece of equipment.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Trust God..........but keep your powder dry!