I got the 2011 iMac for its ability to go both ways. I've been a long (128 days) time Mac user, but wanted PC app compatibility. So, in talking with the Apple salesman he said it would be better to go Native (non emulating). Sounded reasonable to me. Bought Win7 and installed 64 bit to take advantage of larger RAM (12G). Now, to my question: Are there advantages to Parallels? AND is 64bit the better choice? I need help/info. Thanks for your input.