Final Fantasy Tactics is one of my favorite games ever.
Too bad it's so easy.
I didn't like Disgaea, and Tactics Ogre: Let Us Cling Together is the only game that got me mad enough to throw my controller hard enough to break it.
I might try Valkyria Chronicles though, I hear it's fun and it has Vyse, Aika, and Fina in it, so what's not to love?