I would talk to the 'smith and then see about the gun.
The Springfield Range Officer is popular because it's really a workable gun right out of the box, and it's relatively inexpensive, especially compared to a Smith and Wesson. At most, a guy might either work on the stock RO hammer/sear/trigger or replace the hammer and sear, and then (maybe) do a little frame/side fitting, depending on the budget and the goals.
If you start off with too nice a gun, then you really could have gone with a full build using a Caspian frame and slide. If you try and do a budget build and start out with a cheap-o Rock Island, then by the time you're done making it suck less you could have just gotten yourself an RO.
FWIW, I use my Springfield Loaded and a Nelson conversion for rimfire BW. The work I've done on it:
--Replaced mainspring w/ 19# for .22 functionality and trigger pull, replaced MSH from the stock striped to a checkered for looks and grip.
--Replaced and tuned sear spring a couple times to lighten trigger pull
--Replaced grips for looks
--Added poor man's stippling (grip tape) to front strap
Haven't stoned a thing. Trigger is a crisp 2.7#. Shot a nice 286 this week--97 slow, 93 timed (ugh), 96 rapid.