I think the best PSN games (excluding FF7 which if you like FF is a good choice but in a way I don't so much see as a PSN game so much as an old classic re-released) are:
Wipeout HD + Fury expansion
Flower
Flow
Pixel Junk Monsters
Pixel Junk Eden
Battlefield 1943
Warhawk
Everyday Shooter (a real favourite of mine, no Trophies though if that matters to you)
Super Stardust HD
Echochrome
So I'd say you have plenty of choice...
Flower and Wipeout are my twin favs overall that I'd recommend.
Try to be reasonable... its easier than you think...







