If you want running info on the jam bands you mentioned, Relix magazine is for you. I got a free subscription for an order I placed with the Dead's store. Unfortunately, 90% of the bands covered are those mentioned above and then some, none of which I've heard before. Since there's not much Dead current events since Jerry's death (at least not enough to sustain a monthly magazine), Relix had to branch out to cover other musicians and forms of music in order to survive. Unfortunately for me, as a long time Dead Head, no jam band, however good, does it for me like the Dead. To me, it's like me, a long-time Harley devotee, riding a Yamaha Star or Honda Shadow (i.e., Japanese Harley clone): not gonna happen as only the original will do.
While a Relix subscription does nothing for me, it may for any of you into bands like Phish, Moe., etc.
Just my $0.02.