I'd recommend CJ Vandermuhlen over all others.
As a full time gunsmith and a firearms instructor, I see MANY holsters and have watched them used and used a lot of them myself. Vandermuhlen is the best value I know of and the quality is excellent.
A simple holster for your Blackhawk will probably run in the $55 range. A super fancy tooled one is about $110-$125.
CJ Vandermuhlen makes each one on an order basis, so there are no limitations on getting what you'd like. He offers some basic types, but you tell him what you want exactly and he makes the holster to your specs.
Contact me if you'd like his number.