I'll be heading off to school in the fall and am looking to get a new laptop since my midrange Windows PC from 2008 is quite outdated. I had really wanted a Mac for a while now, the OSX connectivity to my iPhone and build quality/styling were major factors in this draw. However, the school I'm attending suggests that for business students it is easier to be on PC than Mac. I will have to run some PC only programs so I will run a VM such as Parallels if I do end up getting the Mac. Would you say that this slows down performance substantially? Also should I get the 15" model MBPr since it offers better performance?