I have a 2009 Macbook pro. I recently added a 256 Samsung 830 SSD and am delighted at the increase in speed and effectual results. My OS is on the SSD while my music, movies, and photos are on the HDD. I would now like to increase my HDD capacity to a 500 or 750 GB. Since I already have the SSD, I'm not too keen on the hybrid Seagate Momentus XT. I've been researching over the past couple of weeks and find several old threads here where the Seagate Momentus 750GB 7200RPM 2.5" is held in high esteem. But then I also find posts from other users who insist otherwise and recommend a WD drive. Any thoughts?