You can go for the originals like Robert Johnson, Son House, Lightnin' Hopkins, Reverand Gary Davis, Blind Blake, Blind Willie McTell.
Or if you want high fidelity modern recordings, there are many fine players including Rory Block, Roy Bookbinder, Paul Geremia, Bob Brozman, and English guitarists who play folk and blues including Bert Jansch, John Renbourn, Martin Simpson. The Essential John Renbourn has quite a bit of good blues playing. Geoff Muldaur is another fine player and singer. Try his album, Password.