If you need to ask the question, and want something more recent rather than original (in the historical sense) I'd certainly recommend Martin Simpson's "Smoke and Mirrors" CD. Outstanding in its own right, he made it as a tribute to his blues influences (many of whom have been recommended above) and an indication of where they've taken him.

Then his recording company screwed up, and embarassed Martin, by getting a lot of the credits wrong. But that's another story.

G.