I'm upgrading to 4GB ram, and am thinking about upgrading my hard disk at the same time. I've read plenty of reviews, but I still can't find a straight answer. I currently have 2x 250GB and 1x 500GB for storage. My OS is on a 160GB Seagate SATA drive with 8MB cache. Will going to a 150GB Raptor noticeably improve OS responsiveness and program/game loading times?