PS2 - The Legends?

[EricJ]

As posted in another thread, I am now past my first 24 hours of Blu, with the purchase of that 60G PS3.

And even though I bought it as a movie player, I didn't forget to get the version with PS2 backward-compatibility included--
I literally hadn't played a new-generation console game in eight years--not since getting hooked on Final Fantasy VII on that old Mac-emulator patch--but bringing home a cheap copy of Kingdom Hearts (one of the main reasons for getting the PS2-enabled machine) is bringing those college-age urges allll back again.

So, with many years of Gamefly rentals to catch up on, I ask the experts--What are the required-reading PS2 Essentials, that all good players most know as sacred?
FF (although I never got past VIII, since it wouldn't play) and the Disney game is a given, and I know enough about Grand Theft Auto...
But I should've paid more attention to G4/Tech's "X-Play" when I used to watch it faithfully, so I didn't keep notes about who was PS and who was X-box--Is there a Hall of Fame out there, particularly for plot/RPG related titles?

(No driving, thanks, can't tell them apart, and any war/Tom Clancy would have to be pretty heavy on the narrative story to get my interest.)