So, I want to upgrade my MBP, which was the first generation unibody Macbook Pro 15". I want to upgrade both ram (at least 4GB), and HDD (at least 500GB) So my questions are these: 1) Does my MBP support 6 or 8GB of ram, or is 4GB the maximum? 2) Are ram prices going to decrease anytime soon? I'm aware of the fact that the ram prices are very high right now. 3) Would I notice a difference from 5400RPM to 7200RPM? I do mostly CAD, and gaming. Would that be a lot faster? I'm asking because for about the same price I can get either a 5400RPM 750GB HDD, or a 7200RPM 500GB HDD. 4) Is Hitachi a good brand for HDDs? Thank you very much for answers.