I am an experienced mac user, but need help selecting a new Apple notebook. I should be going to college for engineering and will be installing A LOT of software on my machine. Also, i need to be able to run both Mac OS X and Windows at the same time via Parallels. Which portable is right for me? I am deciding between the top of the line MacBook, the base 15" Pro, or the top of the line 15" pro. Thanks!!