First and foremost, if you're interested in Dragon Quest, you should hop over
here, and read this guy's quibbles. I haven't played the game, nor do I plan to, so that's about the best I can do for you there.
Of the two Nippon Ichi games you have listed, I'd say go for Phantom Brave, if only because I own it myself. Or Disgaea, if you don't have it.
Kingdom Hearts is a mixed bag for me. I've played through it several times, and have gotten relatively close to the end, but usually get fed up and quit. I haven't played any Final Fantasy game (other than FF Tactics Advance, but I don't think that counts for much), so whatever part of playing this game for that reason is nonexistant for me. Other than that, I find it all comes down to simple button mashing. I'd be willing to give you mine for less than $10 if you'd want, considering you can get it new for about $15 around here.
Other than those few (and San Andreas, which I don't have much to say on), I haven't played any of them. But based on what you have (namely God of War and Prince of Persia), I'd say that you might find Ico and Shadow of the Colossus somewhat interesting as well. And because you possess a PS2, you would do yourself a favor by at least renting either of the Katamari games (if you can find them). Gods are those games fun!
Back to what you were asking about
: of the ones you have listed, I'd say Phantom Brave would be your best option. It has the Disgaea feel with it's own, unique twist.