I have been debating between XP Pro (32-bit) or Vista Ultimate 64-bit for Boot Camp. A friend of mine mentioned he had a copy of Xp Pro 64-bit lying around and that seemed like a decent option since i get the goodness of XP and 64-bit without the uhh Vista-ness of Vista. Is anyone running this? Does it work well? Does it work at all? Do things run better under Vista 64-bit than they do under Xp 64-bit? I'm mostly going to be running Team Fortress/Steam games, Crysis, etc.