I just bought my first Mac and am planning to run Windows using Parallels 5.0. I purchased the new 27" base iMac (3.06 Dual Core). I'm thinking I might as well go with Windows 7, but am not sure which one. I assume I need a full version (upgrade versions won't work if on a different machine I assume). I have no idea if I should run the 32-bit or 64-bit version on the iMac. Also, is there any reason to go w/ Windows 7 Professional or Ultimate or is Home Premium sufficient?[/B] The only feature that seems particularly worthwhile to me is XP Mode. Will Windows 7 really not support older basic Windows programs (like $15 kids games from 2000 or so?) In terms of performance/resource utilization when using Parallels (Windows will definitely be the secondary OS), is there a benefit to one version vs. another?