Seagate Momentus XT 750GB (hybrid) http://www.amazon.com/gp/product/B00691WMJG/ Western Digital Scorpio Black 750GB (HDD) http://www.amazon.com/gp/product/B004I9J5OG/ I'm looking to upgrade the hard drive in my mid-2009 15" Unibody MacBook Pro. I'm a graphic designer so the programs I use most (in addition to the standard web/video player/iTunes/etc. use) are Adobe InDesign, Photoshop, Aperture, iPhoto, etc. Which of the two drives would be best? My biggest priority is compatibility with Mac and long-term reliability. I'd especially be interested in hearing reviews from people who have tried both. On a separate note, I'm running Snow Leopard now and would like to upgrade to Lion. Should I upgrade my OS first and THEN replace my hard drive, or vice versa?