I've always wanted a mac, and after a short but grueling job stint I found myself with enough money to justify the purchase (13" MBP) and not have to live on Ramen for a few months. I couldn't, however, get myself to drop $600 more for a 15". The larger screen and i5 were very tempting of course but I'm now used to the 13" screen so that's not really a concern, but I'm still wondering if the i5 would have been worth it. I don't do any gaming or video editing which I see would benefit from the i5 over the C2D, but I record/edit/produce music. Would it be wise to switch to a 15" i5 from my 2.4ghz C2D, or would the difference be negligible for my uses?