I currently have XP Professional running on VMWare Fusion on my mid-2007 MacBook (2.16 GHz C2D, 4GM RAM, 500 GB HDD) with Snow Leopard. I can get Windows 7 Ultimate cheaply through my university. Would it be worth it to upgrade? Would the higher requirements of Win 7 make it perform worse as a VM? I'm studying for my MS in Applied Statistics, so I will primarily be using it for SAS. Actually, pretty much only for SAS. Maybe a few other Windows only programs if there's anything else I end up needing.