So I guess ideally US based, anywhere works. Really, there seems to be little general knowledge about the best places to get your master molds printed. Besides Shapeways and some on this site with their own, Moddler is the only place I know of with very high quality prints, though costly. I'm just trying to see if there is any kind of competitive market out there, I'm thinking there has to be more than what is currently known.
I spoke at a convention that 3d printing is kind of a catch all turn for processes like objet, perfactory, etc. As a guy trying to get top notch master molds, I'm just trying to poll the pool and broaden my horizons.