Here are some of my recommendations...
Mitch Rosen:
www.mitchrosen.com
M/D Enterprises:
www.customholsters.com
DelFatti Leather:
www.delfatti.com
Horseshoe Leather:
www.holsters-for-handguns.com
Mitch Rosen makes VERY nice and exquisite holsters...also VERY expensive. But he does not do all the work himself. His holsters are well recognized with shooting "pros".
The last 3 are one man shops, and they do all the work themselves. Don't have experience with Horseshoe, but have heard good things. Plus his website is very imformative. Mark, of M/D is a very nice guy who will be more than glad to help you over the phone. He may do some one of a kind custom work if you ask, but don't know for sure. Matt Delfatti runs a true custom shop, and he will alter an existing design, or even work with you to create a new design if you don't see something you like in his catalog.
Also, here are some others you may wanna check out...
Kramer Leather:
www.kramerleather.com
Milt Sparks"
www.miltsparks.com