Most of the bands already mentioned, like the Dead, Claypool, Primus, add some Frog Brigade & Oysterhead, a little Perpetual Groove, a pinch of Elliot Smith, and I'm set!

And personally, I think Phish is still classified as a jam band over a psychadelic band. The same could probably be said for Claypool and all his projects, but then again, his shit is so weird, let's just throw it under psychadelic's just 'cause. ~