I want to upgrade my HDD in my MacBook (Early 2009; MB 5,2). I have my options narrowed down to the Seagate Momentus XT ST750LX003 (750 gb @ 7200 RPM, 8 gb NAND flash) and the Hitachi Travelstar 0S03339 (750 GB @ 7200 RPM SATA II 16 MB internal cache). I have read a lot of reviews on both and after filtering out non-credible/anomaly reviews I am still on the fence. They both seem to be about the same but the Seagate drive seems to be better equipped for the future with it's "hybridness." Or am I just falling into the marketing? I don't do anything very taxing on my machine: word processing, browsing, and programming. I was wondering if anyone out there has seen any difference in battery life with either of these two? Or has anyone tried each of these and seen any difference? Would the Seagate be worth the extra $40?