I’m 6’2″ and on a large, it suits me fine, equally I could have gone for a XL probably, I’d use the Salsa sizing guide but be aware of the amount of frame slope and the TT length.
I agree the frame is well finished, but so was my Singular Swift.
I’d say Salsa do spec a nice build with quality parts on their built bikes, of course buying a frame and building it up yourself is more fun, albeit more expensive. I like knowing there is not another built the same as mine.
In terms of anything as robust and versatile as a Fargo or Gryphon, designed for drop bars, probably not; not without going custom, in which case take a look at Shand.