I'm just about to purchase a quad-core 27" iMac and I'll want to use Parallels Desktop to run software not available on the mac such as MediaMonkey, and for testing websites in windows. I'll only ever be using very basic applications - nothing processor/ram intensive. In terms of speed performance would XP be the best bet or Windows 7. Should I go for 32 or 64-bit? Also, can Parallels read and write directly to specific folders on the mac hard drive?