Well, you already have some good old-school Goa there, although it doesn't seem to get played as often as the fullon. How about including some darkpsy, such as Kindzadza and Psykovsky, some forest such as Derango and Kiriyama, some progressive psy, some twilight psy, some new-school Goa, some Suomi (other people are better qualified to offer recommendations for these last four genres than I am). If you're not already familiar with those styles and more, I recommend checking out Ormion's Introduction to Psytrance series. That will give you a ton of ideas for artists to include.