What are you referring to as "PSX"? That's the nickname for the original Playstation One, in which case your options will be somewhat limited.
If you're referring to the Playstation brand overall, up to and including PS3, and you want something like the Elder Scrolls... well, PS3 has Oblivion. So there you go.
At this point, I think that's about it, though. Oblivion is great, but I personally prefer turn-based games when I think of RPGs. Real-time combat takes it from an RPG to what I think of as a action-adventure-RPG, which isn't the same thing.