[quote name='LostRoad']Hmm, besides alot that has been listed I would have to say some of the best I have heard in a few years in the title screen music for FF X2, sadly it was the only good part of the game.[/quote]"Memory of Light and Wave"... yeah, that's a great piece. Disagree with you about it being the only good part of the game, though ;P
As for my favorite RPG OST, it's currently FF5, closely followed by FFT. FF7, Chrono Trigger, and Skies of Arcadia are up there as well.
An aside... fave boss theme of all time: "Dancing Mad" from FF6 (runner-up: "Maybe I'm A Lion" from FF8). Also, my current favorite game soundtracks (any genre) are Sonic 3D: Flickies Island and Sonic Rush.