I'm in the market for a new laptop and I've decided on the rMBP 13'', but I'm having trouble deciding between the i5 2.4gz and the i5 2.6gz. The benchmark scores show a slight diffrence between the two (~7%), but I'm not sure how big of a difference that will actually make when doing work. I plan to use it for some video editing and use of programs like MATLAB, aswell as everyday use. Obviously having a 15" with quad-core would be best, but portability and price are an issue. Thoughts?