Hi all, I have an early 2008 MBP model (pre-unibody) and bought it with the stock 200 GB HD and 2GB memory. Although it still runs pretty well I want improvement in performance and I'm planning to upgrade to 500 GB 7200 RPM hard drive with and 4 GB memory. A few questions: With these upgrades, can I expect significant or just a little improvement in performance? And do you think this can last me a couple more years? I've never done hardware upgrades before so I really don't know much, but can I upgrade the hard drive and the memory at the same time? Or should I do them separately to make sure that one works properly before moving on to the other? And just for reference, the most intensive task I do is editing photos in Photoshop and Lightroom (mostly with 18MB RAW files). Thank you in advance!