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(someone told me he was the best in Arizona)
Tough call, lot of good 'smiths in Arizona. I'd say there must be something in the water, but there ain't any, is there?
Check his backlog, it might be outrageous, and he might not even be taking new jobs. Some 'smiths have waiting lists to get on their waiting list...
Anyway, on to the question. It really depends. The easiest way to the best gun is to build on a bare frame and slide, not a base gun like a Colt. That way the 'smith doesn't have to fix the Colt factory's mistakes (they can be numerous), and gets the perfect fit for everything since the frame & slide start oversized. However, custom jobs built on Colts have more "asthetic character," for want of a better way to put it, and for this reason the current Series 70 reproductions or WWI/WWII repros tend to be favored by alot of 'smiths for "ultimate" custom jobs.
You can get an awesome job both ways, it is more a question of what you want than anything else. I've had 2 custom Colts, and am waiting on a built-from-scratch custom job on a Caspian frame & slide. I went with the Caspian because I wanted a particular set of markings on the gun and a custom serial # (it is a sort of commemorative piece).
For me, the ultimate base gun would be a pre-Series 70 commercial Colt, with the current Series 70 repro being a close second.