Hello! I've finally made the decision to get the low-end model of the Macbook Pro with the student discount and free iPod Touch. I'll be using an Apple credit card so I'll also be getting $75 free iTunes points. However, I'm torn between the decision to upgrade to 4gb or not. I will be using the computer for games like Counter-Strike: Source as well as recording my songs with Protools M-Powered. I know 4gb would be better - but is it worth $200 extra? What does everyone think? Rip off?