I'm looking to upgrade my MBP (March 08, multitouch) to a 500 GB hard drive, and I am not sure which one to go with. I am looking at either the WD scorpio blue or the seagate momentus 7200.4. I am curious if there are any people who have had experience with both and could comment. I like that the seagate is 7200 rpm, but I have heard the WD is almost as fast and is possibly more reliable. This is replacing the OEM 200 GB 5400 rpm drive. I thought about a 320 gb drive, but would rather go big and only have to upgrade once for the lifetime of my computer.