I like the early floyd stuff the most by far..
A lot of the earlier Pink Floyd songs are all instrumental, and while tripping its quite a journey. I remember listening to the album More and A Saucer Full of Secrets while on a high dose of DXM, seriously MADE that trip for me, set the entire atmosphere while listening to it...floating around on giant Amanita colored 'Mushroom-flowers'.
My favorite albums would have to be: Atom Heart Mother, More, Ummagumma, A saucer full of secrets, meddle, and piper at the gates of dawn.
I still love the newer stuff (all though I've never been a big fan of the Wall) but the older stuff just seems so much more psychedelic and mythical and often very remniscent of the time I visited the Sacred Tree Realm while on a dose of smoked DMT in the middle of the forest (The album 'More' fits this trip quite well).
I'll check out some of those bands you listed, I been looking for random new music to get lately.