I suggest you check these out:
Hallucinogen: Twisted, The Lone Deranger
Etnica - Alien Protein, Equator
Pleiadians - Identified Flying Object, Family of Light
Crop Circles - Tetrahedron
Infected Mushroom - The Gathering, Classical Mushroom, B.P.Empire
Astral Projection - Trust in Trance, Another World
Psysex - Expressions of Rage, Hardcore Blastoff, Come in Peace
Hux Flux - Cryptic Crunch
Logic Bomb - Headware, Unlimited
Talamasca - Beyond the Mask
Man With No Name - Moment of Truth
Planet Ben - Trippy Future Garden
Toi Doi - Technologic
Juno Reactor - Bible of Dreams
The Green Nuns of the Revolution - Rock Bitch Mafia
this thread on psynews might be of interest to you:
http://www.psynews.org/forums/index.php/topic/53017-top-10-psytrance-albums-of-all-time/