Well, that's a good start! As you may well have noticed, there are quite a few subgenres within psytrance. Most of what you've posted up falls under the 'full on' category. I'm into the more deeper/darker stuff, which I personally find a lot more psychedelic. But it really is a wide genre, with subgenres including full on, melodic progressive, psygressive/dark progressive, dark psy, forest psy (my personal favourite), Suomisaundi (which is a freeform style of psy from Finland... very odd stuff), twilight... and then you've got old school Goa and new school Goa... I've missed quite a bit out here, but this is just to give you an idea, hehe.
Anyway, my favourite artists are, without a doubt, Atriohm, Encephalopaticys, Electrypnose, Grapes of Wrath, Farebi Jalebi, Vertical, Papiyan, Baba Yaga, Kuro Fusion, Kerlivin, Derango, Gu, Drone Bixie, Arjuna, Savage Scream, Maniac Bubbles, Orestis, Megalopsy, Cosmo, Kindzadza, Ajja, Highko, Insector, Furious... these all lie in the forest & dark psy territories. Some of these artists are
highly psychedelic and are really interesting to listen to when you're trippin'!
As for the more melodic side of things, the three artists I'd swear by are Sonic Species (the 'Machina Terra' EP is off the chain!), Ovnimoon (the album 'Family of Light' is the best, IMO... very melodic and atmospheric) and Hypnocoustics (up-and-coming act from the UK who also make very nice melodic psytrance).
Goa-wise, I'd recommend
old Astral Projection (their full-on stuff is naff, but the music from the first couple of releases is funtastic!), Filteria (absolutely manic new-school Goa trance - some of the most energetic music I've ever heard) and Khetzal (lovely, ultra melodic new-school Goa trance with a polished production... check out his album 'Corolle' in full... the tracks are very varied but the release somehow manages to flow perfectly).
There's also the psygressive/dark progressive stuff, which is worth checking out. My favourite out of the lot is Sensient (my favourite album is his most recent, 'The Space Between'... it's like a cross between dark progressive and minimal...), but everything released on Zenon Records is worth a go. (This genre is also called 'Zenonesque' by some.) Hypogeo and Opsy release the darkest stuff in this subgenre, I think.
Two websites I really recommend:
1) Ektoplazm. This is a free net label that has a plethora of brilliant releases. Browse through the different genres and download stuff you like the look of. You can also stream all the albums if you want to hear before you download. But, as I said, all the albums are free (legitimately), which is brilliant.
http://www.ektoplazm.com2) Electrypnose's website. This artist is ****ing brilliant. I cannot recommend his stuff enough. I'd say he was one of the best producers in the scene, and he's done a good job of creating his own sound and applying it to many different styles within psytrance (and electronic music in general). The guy has a lot of integrity too - he releases all of his music on his website, which you can pay £30 for a year's subscription. If you don't wanna pay for anything, you can stream all of his music in the link below, all of which can be found through the different subgenre labels he makes music in.
http://www.electrypnose.com/index.php?page=musicHahah, wrote a lot. I'm a huge fan of psytrance, though!
Oh, and blatant spam, but if you get bored and want to listen to the stuff I make by myself and with various friends, check out:
http://www.soundcloud.com/kodamapsyhttp://www.soundcloud.com/jotunnpsyLet me know if you enjoy any of the artists I posted above, and I can maybe recommend some more albums or whatever.