Long time mac user, never booted up windows on my mac. When new MPB's come out, going to try it for the first time (with boot camp) for some PC gaming. Probably graphic intensive games like Orange Box, Call of Duty 4, etc. Looking into purchasing a Windows license and wasn't sure if Vista or XP was better for gaming. Also curious what I should expect to pay for a windows license -- non-upgrade (since I've never owned windows before). Most of the non-upgrade versions on newegg seem to be over 200 bucks. There's gotta be a cheaper way.... i hope.