check out Shiva Chandra, X-Dream, Tron, Green Nuns of the Revolution
for more modern stuff check out Electric Universe, Deja Voo, and search for mixes from festivals like Vuuv. If you can find Burner on soundcloud, his mixes are awesome.
most of the psytrance I listen to is random stuff i hear in mixes or at festivals though. and you can download loads of free stuff (legally I believe) from ektoplazm.com. they have a section for all different styles - goa, dark, forest, full-on, daytime, minimal etc
i'm putting together a psytrance set at the moment for a 2-day festival me and my friends are putting on in the middle of nowhere. should be fun