Again, I'm not sure which styles of pistols we're talking about, but for a double action carry type revolver, I reccommend Dave Sams, who is currently building a carry Colt Agent for me. I have tried some of his revolver work in the past and it is incredible. His turnaround time is very good as are his prices! Dave is primarily known for his semi work, especially his Match Berettas for the Army Marksmanship Unit, but he does fantastic work on just about anything.
http://www.samscustomgunworksusa.com
Also, as Mr. Lamey said..SDM Fabricating does some great work, I have a Colt Delta that I bought off of Gary (above) and it is simply incredible!! (Thanks again Gary!

). Cylinder and Slide and Grant Cunningham also come quickly to mind. Any of these should be able to build just about any platform that you would want, Best of luck!--John