Hi, my brother ordered a base model MBP today, but we still need to decide which version of windows. He will use boot camp for serious gaming, so we'll probably also upgrade to 4GB (I didn't order it directly because they charge like 360 euros for 4GB). My question is: which version of windows should we use? The guy at the store gave a confusing explanation. But what I understand is: XP will only recognise 3 of the 4 GB RAM Vista 32-bit will only recognise 3 of the 4 GB RAM Vista 64-bit is crappy with a lot of USB and video driver issues, but will recognise all the RAM Plus, vista uses more Ram to run, but offers DirectX10 to complicate things further, there are a lot of vista versions, but does any of those offer an advantage for gaming over the home basic version? Since it won't be actually used as an OS (rather as a platform to play great games) the bells and whistles aren't important.