I wouldn't recommend FFCC (GC), it's not really an RPG and it's very repetitive. hack is also pretty mediocre.
I would say the best RPGs for the previous gen are (assuming you have a PS2 and GC:
Xenogears (2nd best RPG ever. PS1 but playable on PS2)
Suikoden (everyone)
Tales of Symphonia
Skies of Arcadia
FFX
Xenosaga is very good as well, just below these above.