I organize my stuff like this:
Chill (ambient to downtempo, anything a bit relaxed)
Deep (progressive and deep trance - vibrasphere, 12 moons, human blue)
Goa (the real stuff)
Psytrance (most modern releases)
Strange (finnish/aussie/japanese sound and eat static)
Techno (hard as authentik, deep as auricular)
Trance (cheeze i rarely listen to... yahel, armin, etc)
Other
Its a bit tricky to sort like that on a shelf, because most of what I own is Goa, followed by a lot of Psy, and then just random smatterings of the rest... though all my 'Deep' stuff is really growing; its mainly what I like these days. Thank you Sweden
peace