Enlightened Evolution is one of my favorite tracks, but everything on Trust in Trance is solid.
Hallucinogen's big hit is LSD, which has been remixed endlessly. World Sheet Of Closed String Mix adds 50% to the running time, but is well worth it. There's also a Astral Projection remix which combines the two giants.
Chi-A.D. is another staple in the genre. Exit Eternity shows up in my Youtube suggestions every day, and I never pass it up. Astral Warrior is another epic track.
While Paul Oakenfold's Glow in the Dark is more traditional Trance, I can't leave it out. It's just too good.