Mines are:

Final Fantasy X

Disgaea 1

Tales of the Abyss

DQVIII or Dark Cloud 2. Hard to pick for me.

Naz you should try MS Saga if you ever run into it.

Valkryie Profile 2: Silmeria & Star Ocean: Till the end of Time. Two of Tri-Ace's best of the best.

Final Fantasy XII.

Most memorable? I would have to say FFXII.  Because it embodied everything I think the FF series should have stayed away from.  From the battle system to the poor story(IMO), it was a let down of the FF series.

In a good way ? FF X lol.

PS: This Dragon Quest VIII... is it good enough to warrant buying today?  I am intrigues as to why I never heard of it before.

Ah, true. He said memorable, not good. I will never forget the awfulness.

Ah, Naz. You so crazy. You crazy.

Really though let's not start this fight here, I don't want to embarrass you in front of the forumites.

Persona and FFX, with a quick nod to Kingdom hearts

Dragon Quest VIII is a great game and it's only 10$.

I would by it. Its one of the best PS2 RPG's and its a steal for that price.