I would go with Ratchet and Clank: Up Your Arsenal. It's an extremely fun game, and it's the shortest one of the games you listed. Might as well get that out of the way first.
Tales of Symphonia
Ratchet and Clank Up Your Arsenal
Star Ocean Til the End of Time
Final Fantasy X
Final Fantasy X-2
I would go with Ratchet and Clank: Up Your Arsenal. It's an extremely fun game, and it's the shortest one of the games you listed. Might as well get that out of the way first.