These are mostly bluegrass/jazz/folk type stuff, but all excellent:
1)Anything by Jerry Douglas, but esp. "Slide Rule"
2)Anything by Jack Williams - "Eternity and Main" and "Winterline" are his best, IMO. Folk player, incredible picker
3)I second Tommy Emmanuel - try "The Day the Fingerpickers Took Over the World" This is with Chet Atkins
4)Anything by or with Doc Watson
5)David Grisman - "The David Grisman Quintet"
Z