So I have a chance to get an older version Powerbook 15" for a good price. Or for $100 more, I can get the current one that Apple offers. The rep told me the differences were better battery life, higher resolution screen, more video RAM in the graphics card, and from my own checking, I think there's higher speed RAM. Anyways, what do you all think, is it worth an extra $100? I'm a college student, so money is important. But I'm more than willing to pay if you all here think it's worth it to get the newer model.