I tend to think more in terms of songs to jam around than progressions. This way you get just a bit more song structure- it can be either an all A section song ex. (Eric Clapton Cocaine) or (The Thrill is Gone- BB King) This structure usually combines verse and chorus, usually with a stop for the turnaround
An A/B section song has clearly defined verse and chorus structure.
Mary Jane's Last Dance (Tom Petty) is a good example. (Great jam tune too)
An A/B/C structure combines Verse, chorus, and bridge. That's my favorite song structure- the least boring but not so complex that you cant remember the changes. Sweet Melissa by the Allman Bros is a good example. there are many. Most Beatle songs had an ABC pattern.
I chose these examples because of the groups you listed in your sig line. There are of course many many examples that would be fun to play with a keyboard player and another guitarist.
One of my favorite all-time jam tunes is Spooky, as done by the Atlanta Rhythm Section. Its rock, blues, and jazzy all at once. Could be great for
slide in E once you master the changes and figure out the jazzy little chord voicings.
barry