Are there any rumors of the MBP maybe receiving an upgrade fairly soon? I've been wanting to switch to a Mac for a long time and I don't want to upgrade and have a new version come out the next month. I'm long overdue for an upgrade to a Mac because I've had a ****** Dell for so long, and I'm really anxious to get a Mac now so I can use it at school next year. I was looking into the 13" because it's quite a bit cheaper, and I think I want to get the higher end version of the 13" (which would be $1399 with my student discount). But I can't help feeling that the Core 2 Duo (which I believe the 13" has) is outdated and much slower technology than that of the i5 (for the 15"). Is there really that much of a difference in performance? Should I shell out the extra $300 or so to get the 15" and the i5?