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Thanks John, My smith has the gun but we haven't really talked about what parts are going into the gun other than the magwell. The replacement of MIM parts was just mentioned briefly, so I'm just doing my homework on parts

You're in luck because there are a ton of high quality aftermarket parts out there. Personally, I am partial to EGW's parts but I have had good luck with Cylinder and Slide parts, Caspian parts, Wilson parts and Ed Brown parts in several different guns. I have also heard good thinks about King's, STI's and Chip McCormick's stuff but don't have any first hand experience.
As John said, let your smith pick them. After all if your going to shell out the cash for the work you had better trust his judgement otherwise you won't be happy with the end result (JMHO).