Hi all. Just bought a PS3 a couple weeks ago and am loving it along with my 360. I purchased Killzone 2 and finished it. I also own Resistance, MLB 09 The Show, MGS4 and The original Metalstorm. Now here is my question. This weekend Gamestop has buy 2 used games get one free. What games are a must have or great games to own used? I know I want "Uncharted" as one out of the 3. Thanks for you advice in advance.