Should I get Vista or XP SP3. I have the 2.0Ghz Macbook Aluminum with 4GB of RAM up from the standard 2. I am only really getting it to play some games and maybe some upcoming titles so I was thinking Vista for more compatibility but does it use more of my Mac's resources to run? Will I get a faster experience overall with XP SP3 or should I just get Vista? Thanks for the help!