Looking at the Mac Pro (3.0ghz with the ATI card, as it is more powerful than the nvidia one shipped with it). What differences will I see running games (ie. WOW, Madden 2007, Company of Heroes, Half Life, etc) when using Windows XP w/ bootcamp on the Mac Pro? Will there be that much of a difference from what I run now (2.8ghz intel, 1 gig ram, 6800gt video card, windows xp pc) ? Comments welcomed.