I've really had no rhyme or reason as to who i've used, though wait time has influenced that some.. I trust most of the smiths that frequent the hide or have great reputations. There is a pretty big list now a days. George Gardner, Chad Dixon, Jered Joplin, Mark Gordon, Robert Graduous, Josh @ PVA, Josh @ Area 419, Terry Cross, etc. etc. i'm probably leaving plenty out. I used APA for my 700 back in the day, used LRI for my Tempest, have had GAP polish my breaching ring on my Tempest, and having dad's rifle built by Mark Gordon.
FWIW Mark's turn around right now on complete builds isn't bad by any means either. IIRC i sent dad's 6.5 SAUM parts off in July and we're expecting a September delivery or so. That's all parts supplied of course.
I will say if you just need the barreled action spun up and want it now Chad @ LRI pretty much guarantees a 14 day turn around less something has changed. He did my Tempest in exactly 14 days, my buddies deviant in like 10 or so.