My personnel top (per style):
-Melodic/melancholic: California Sunshine, ManWithNoName (Teleport album) & Electric Universe,
-Funky: KoxBox & Green House Effect,
-Acidic: Bassline Baby, Color Box & Hallucinogen,
-Dark: Xenomporh & UX,
-Psytrance (not mistaken with Full On): Pigs In Space, Wizzy Noise (the 90's unrl tracks), MFG (album The message) & Etnica (from '97-'99).
What they all have in common (imo)?
a ) Good production - not clean but clear and distinct with always deep/organic kicks and baselines with a solid melody and climaxes/melodies that always have the right sound,
b ) Good mixing skills - the music layers interact always to form a whole,
c ) A unique sound - everyone knows who made the track, there is a big sense of identity, there is no urge to imitate what is popular,
d ) Important: not loud, not noisy, but balanced in sound and volume: not need to make music that (only) 'sounds good on a big system' - lol!
e ) All are deeply trancy in effect on the mind when you listen to the details, there is a trance journey they take you on, the tracks tell a story like a book. They are really composing music from out a very rich musical background (the psy rock from the 70's, the synths and music styles from the 80's where the Goa-blend comes from) ... and not programming notes into a computer or simulating an existing sound from the '90s or so on.
-Newer goa (not a diffrent style, just another period & in no particular order and to my personnel taste):
Artha, M-Run, Ufomatka, Ra, Lapsus, Morphic Resonance & Kethzal.
I feel these really contributed some unique energy and their own interpretation to the scene that I think these guys music will last the coming generations and beyond.