Chris Whitley (blues-rock-jazz mix, try Dirt Floor and Living With the Law)
Robert Cray's first album (Strong Persuader)
BB King
Buddy Guy
Willie Dixon (the Chess Box 2cd collection is great, both him and other people recording his songs)
John Lee Hooker
Jeff Healey
Robert Johnson though I have to be in the right mood for old, scratchy, lo-fi recordings
ZZ Top - blues-rock, the old stuff like "Jesus Just Left Chicago" and "Hot Blue and Righteous"
Aerosmith - Toys in the Attic, more good blues-rock