No real list that I'm aware of. however, let me get this straight...you want specialized custom work done on your Rugr SA's that will be done quickly and inexpensively...Hmmm, those criteria don't go together. the smith's with higher costs and longer lead times have those because they ARE that good. Thier customers know of thier quality and know they'l recieve nothing but the finest quality work. The cheap guys, well, that's what you get, cheap work. shortening bbls should be able to be done by any gunsmith along with adding the banded front sight and well, the other work too. What type of finished product you get back, well, like they say, you get what you pay for and don't forget, Rome wasn't built in a day.
were it me, I'd want someone that took pride in thier work and that the finished products showed the quality. My choice, Bowen, Limbaugh, Maybe even Clements or Reeder.