Is Six Organs of Admittance too obvious?
Jozef Van Wissem (lute player. Seen him play in a fantastic duo with Tetuzi Akiyama)
This young chap from Ireland named
Cian Nugent
Older folks:
Peter Walker
Sandy Bull
Munir Bashir (Iraqi oud player)
Also if you like the ragtime style guitar stuff that Jack Rose does you should definitely give
Elizabeth Cotten a listen.