I'm pretty new to Macs. I currently have a MBPr 2.3ghz i7 512SSD 8gb RAM... need to run windows for some programs I'll need for my new job. Pretty sure I'm going with Windows 7, but am open to other suggestions. I'm curious though, will the 32-bit, 64-bit versions matter and if so, which one should I go with? Also, any advice from people that have used Parallels before would be greatly appreciated.