Third vote for Norman Blake . . .

Etta Baker
Paul Geramia
Memphis Minnie
Brownie McGhee
Bonnie Raitt (well, if you put Joni Mitchell and Joan Jett on there, you have to have her)

and I just saw Wayne Hancock in concert and the two electric guitarists he has in his band kick butt (Wayne himself is mostly limited to flailing away on the rhythm).