Mark, I'm a little late to post but here are a few suggestions that are a little more off the beaten path.

The following three artists are in the same blues genre (I heard Keb Mo call it gut bucket blues).
Junior Kimbrough
R. L Burnside
The North Mississippi All-Stars

For classic old country style blues:
Lightning Hopkins
Mississippi John Hurt

An incredible one man band:
Richard Johnston, "Foot Hill Stomp"

If you're liking the Allman Bros give Blind Willie McTell a listen-Duane and Gregg were huge fans and you can hear a lot of McTell in much of their recordings. Gov't Mule and The Derek Trucks Band are also pretty fine.


M22's, VP150, QS4's, HK 630, HSU VTF3-MKII