A Mac is a perfect way to go for college, especially in the Comp Science section. I don't suggest calling UC Berkeley ahead of time to talk to students, etc all about a Mac vs PC. You're guaranteed happiness, ease and satisfaction. My friends just graduated from there and they used Macs and never had an issue. Especially with how in sync files are between mac & pc you'll never have an issue. Everything you do anyways can be run on both machines, if not you have bootcamp, parallels, vmfusion, etc. Best of Luck, I'd only recommend a 15" for the power and it'll still be strong by the time you graduate (if that's your thought process, and no I'm not saying a 13" wont be when you graduate).