I want to get a BP rifle kit that is .45-.50ish, percussion, a kit that I finish and put together . . .
Also, I'd want it to be acurate enough to hunt with, and shoot semi-competitively.
Which company?
Which manufacturer?
Anybody selling a Sharp's kit?
Any companymanufacturer to stay clear of?

Because you want to hunt, get a .50 caliber. As for the semi competitive edge you're looking for, if you mean Rendezvous or local clubs, you might get by with something like a Lyman Great Plains Rifle. They are accurate and come in kit form, and are excellent hunting rifles. They shoot roundball very well. If you're talking compete against teams, you might want to spend some money on a custom rifle.

Other good rifles are Pedersolli. He also has some of the Sharps rifles I think. You might check his sight..
http://www.davide-pedersoli.com/FuciliCategorie.aspx?lang=en

Deer creek North West rifle is probably the best out there that offers excellent groups for 50-75 and 100 yard shooting with PRB.

I have that rifle in .45cal and it is by far the most accuracy sidelock i have shot.

Give them a call at 765-525-6181

I guess you mean a traditional sidelock percussion. Head to Dixie Gun Works. They've got a boat load of kits in a bunch of price ranges. Youmight can beat their prices by shopping around, but they've got a really good selection.And they've got a variety of Sharps rifles.

I'm just getting back into it myself and have the Traditions St. Louis Hawken on order, but that's what I could afford. I'm sure it'll do what I need, but I don't need much. If I had the money, and wanted to do some competitive shooting, I'd darn sure have gone for the Lyman Great Plains.

edit: Forgot to add the link.

http://www.dixiegunworks.com

One useage coming up is what the local club calls a
"Long Range Buffalo Shoot."
100 - 800 yards.

Sounds like BP cartridge rifle shooting to me....

Yep. That's what it is. Never done it but it sounds like fun. There's the Sharps, Remington rolling block and the Winchester Hi-wall replicas that would all work. They've got all of 'em at Dixie.