Hello!! I am planning to go back to the graduate program to major in mechanical engineering. I plan to invest a new laptop that will allow me to use numbers of CAD software such as Pro-E, SolidWork, AutoCAD,etc. as well as other engineering programs. More likely, I probably use the Bootcamp to access these CADs. The question is, which macbook pro shall I go for? 13" with dual core or 15" with i5? Please help. Thank you for your time.