Suikoden IV is the best out of them.
Kingdom Hearts 1 is good too.
Final Fantasy X marked Final Fantasy's fall from grace for me, but its still a decent game.
^ gotta agree with everything said here.
Personally if you're getting into PS2 JRPGs, pick up Dragon Quest VIII, best one on the console.
I already have Dragon Quest VIII :) I just didn't bring it home for christmas by some strange reason :P
What a shame, it's a great game.