Hi, I am upgrading my Core (1) Duo Macbook Pro, (yeah, a first gen MBP). I am considering the high-end 13', I know the 15' is a quad core, but I don't think I really need it. I am planning on upgrading the RAM of my 13' to 8Gb. If I go with a 15 there will be no $$ to do such upgrade. I don't play games on the laptop (I have a WinBox for that), so the GPU doesn't bother me. I do however run some VMs at times with other OSes to test somethings. My question is, will the 13' be ok for this or should I just go 15'?