Hello, I am planning to buy an Apple MacBook Pro, which I am going to use as my main computer for editing and post-processing images. It will be connected to a 23" or 24" external display. Because it will be my main computer I am wondering whether I should upgrade the processor from the standard 2.53 GHz to the 2.8GHz Intel Core 2 Duo? Am I going to recognize an improvement in speed when batch processing RAW files with the 2.8GHz processor over the 2.53GHz that will justify the price premium? Will the optional 320GB 7200-rpm hard drive increase the notebook's performance with regard to reading and writing files to the hard disk-based cache? Your opinion and feedback will be greatly appreciated! Thank you very much for your help! Andy