I have a MBP Penryn 2.4. I want to upgrade my hard drive from the original Hitachi 200gb 5400rpm to a 500gb 7200rpm. Any recommendations on what brand to go with? I was thinking about sticking to Hitachi since my MBP was made with it. Also I want to upgrade my ram to 4gb or 6gb but not sure which brand to go with. I looked on newegg.com and saw that only Mushkin has 4 cas latency. What would be better, getting 4gb with 4 cas latency or getting 6gb with 5 cas latency?