I currently have an 11 month old MacBook Pro 2.4 4GB RAM 15 inch (non-unibody) and am thinking about selling it and getting the new 13 inch 2.4 4GB RAM MacBook instead. I would like to have the portability of a 13 inch computer because I am always taking my MBP places and wish it was a bit smaller. My question is, would I notice much of a performance difference between the two? I am very satisfied with the GeForce 8600 (for now at least, pending any upcoming problems) and was wondering how the two compare based on performance. I have read that the 9400 is better at rendering and playing HD movies, but I mostly use my MBP for music, word processing, light photo and video editing and internet access. Any constructive input would be well-appreciated.