Am in the process of buying a new 15" MacBook Pro and am looking for some info on whether or not its worth upgrading the processor to 2.6Ghz (from the 2.3Ghz model). I did a search but got no clear info. I mainly work with Aperture and Photoshop (on massive Nikon D800 RAW files). I know the GPU will take a lot of the load but I'm not sure how much difference the 0.3Ghz will make to my particular workflow. Any advice would be appreciated.