So, now that I've decided to get the matte screen on my new 15" Macbook Pro, the only question left is about the hard drive. Should I get the 7200 RPM drive or stick with the 5400 RPM one? Assume for the purposes of discussion that the extra money is not relevant. What are the things I should be thinking about? Is battery life significantly impacted by the 7200 RPM drive? Is the data transfer rate significantly better? Thoughts?