I was considering upgrading my old PowerBook G4 to the new MBP 15" for quite a while and even took part in the waiting game along the lines of this forum. However, I recently came to realize, that a 13" MBP will cover all my software development needs on the road just as well (or even better, as it is smaller and has a longer-lasting battery). Now, the 300$ question: Is there really that much difference between 2.4GHz and 2.66GHz? I am considering pimping the RAM up to 8Gb and going for an Intel 160Gb SSD. I cannot, however, justify the 300$ difference for a mere 10% CPU performance. Am I being conservative?