Oh! Note on Star Ocean 3: The original Star Ocean (Super Famicon) was, by far, its superior. Don't get me wrong, SO3 is a good game, but it's not great... If you are as much into RPGs as me, you'll have to get Tales of Symphonia and the GameCube to play it.
Other than that...DQ8 is a great choice. KH and KH2 are two of my, personal PS2 picks. I've been playing a lot of Grandia...still haven't beat it :xp: I want to get more into the Wild Arms series... There's always Xenosaga I and II. I also, personally, like Disgaea and Phantom Brave. They look odd, at first, but they do play very well.