I have an 'old' (non unibody) MBP with the following (very good) specs: 4gb RAM, 2.5 GHz CPU. The machine is great and nice and fast for everything else, but takes up to a few seconds to render RAW files in Aperture, which interrupts my workflow. I assume that CPU speed and graphics card are the driving factors in this? I am interested in upgrading but I guess that going to 2.8Hz (or even 3.0) is not likely to make a perceptible difference and I should probably wait another few months for even better processors. Or would the dedicated graphics in the uMBP also make a big difference? Interested to hear your views. I am processing D700 files which are >10mb in size. Thanks! Hooly.