Try the Blue Hart Trio on Mapleshade Records, you might also look at the Burnside Records catalog, they have quite a few good acoustic blues.
The biggest problem with acoustic blues is recording quality, which is why I suggested the Mapleshade stuff first.
Csericks suggested Cephas & Wiggins, they have at least one thing recorded on Chesky, which is pretty good.
Weirdly enough some Hot Tuna and Jorma Kaukonen (sp?) fall into this category and you can find good quality recordings of them.
The biggest problem with acoustic blues is recording quality, which is why I suggested the Mapleshade stuff first.
Csericks suggested Cephas & Wiggins, they have at least one thing recorded on Chesky, which is pretty good.
Weirdly enough some Hot Tuna and Jorma Kaukonen (sp?) fall into this category and you can find good quality recordings of them.