I am torn between getting the 13" MBP for $1129 and the 15" MBP for $1709. I use iMovie a bit and game somewhat (mostly Windows XP-era games on Boot Camp). I have a couple of questions: 1. Is it ridiculous to pay $600 more for a discrete graphics card and larger display? 2. The 13" has 4GB ram; the 15" has 8GB. Is there a noticeable difference? 3. As I mentioned earlier, I have a lot of old Windows games that I'd like to play. Will both Macbooks run these well (graphic-wise)? Thanks.