Blues recommendations anyone?

Just a quick update. I've printed out the responses so far so I have a list to work from, and I just ordered some cd's to get me started. They are:
"Lady Day", The Best Of Billie Holiday.
"His Best" by Sonny Boy Williamson.
"The Complete Recordings" by Robert Johnson.
"The Complete Blind Willie Johnson".
"Complete Recorded Works of Son House & The Great Delta Blues Singers".
"His Best 1947-1955" by Muddy Waters.
What do you think?...will these get me off to a good start? I'm thinking so!
Thanks again to everyone!
Cheers!

As stated above there are LOTS of sub-genras in blues.
I love the Lomax/Library of Congress recordings that were done on wax cylinders. Terrible sound quality but great music.
Delta blues and Country blues are my speed.
Early Chicago blues is great too.
There are quite a few current artists at CDBaby.com that are wonderful too.
Fas Posum Records has three samplers that are cheap and have some awesome songs.
I glanced at the PBS box set soundtrack from the Scorsese documentary and it looked like a good place to start.

Good luck!

I would suggest looking for some original Fleetwood Mac back when it was Peter Green's Fleetwood Mac. There have been some good anthologies coming out lately. Some of Peter Greens solo stuff is good too.

Other sub genres include zydeco and blues piano (both of which tend to be Louisiana-centric). Many rock fans find both genres easy to love. For the former, you might try Zachary Richard (Fatras! is great, but any record featuring Sonny Landreth on guitar will do). For the latter, Professor Longhair is the go-to guy, although James Booker's Lost Paramount Tapes is also a great record.

Happy hunting!