Saiyuki: Journey West,
King's Field 1 & 2,
Shadow Tower,
Persona 2: Innocent Sin and Persona 2: Eternal Punishment,
Ogre Battle: March of the Black Queen,
Kartia,
Hoshigami: Ruining Blue Earth,
Legend of Legaia
Can't think of anything else that hasn't been listed yet.
Also, are you talking about "complete" PSX RPG's, NA PSX RPG's and/or PAL PSX RPG's?