I really enjoyed KotOR and KotOR II. The first game had a bit more on the story side, but the second had an evolved items and powers system, more interesting combat, and IMO better characters. The second game is a little shorter, but very pretty. And if you slogged through the d20 retardedness of the first game, the second is built on the ruins of the first, but with shinier buttons.
Personally, I like 2 better.