After a six or so years, I need to replace the SATA II drive that appears to be about to die. The current HD is a Hitachi Deskstar P7K500 500 GB and partitioned into two logical drives - 360 GB (161GB free - OS + Programs) and 107.5GB (84 GB free). I'm thinking about installing a SSD drive just for the OS and a new HD for the programs and docs. And suggestions as to whether or not this is a good idea or should I stick with a spinner? The box has a second 250 GB drive already that's slightly younger.