This will be my first Mac purchase. I have been a PC user for 10 plus years. I am looking to buy a Macbook Pro but I am unsure which one to get. I basically will be using the computer for work and home use, internet browsing, watching movies and music, some photo editing and not to much more. I am trying to pick between the stock 13 inch and the 15 inch with a high res screen. The 15 inch will be a lot more and I am not so sure if it is worth it. How big of a difference is the high res screen? Do i get glossy or matte? Also how big of a difference are Duo Core Processors and i5 chips? Is 4 MB of RAM enough? Any help and advice would be much appreciated. Anything you can add to help me make my decision would be great as well. Like I said this will be my first Mac purchase so I need as much help as I can get. Thanks!!