Hi everyone, UPDATE: I had a typo on the subject...this is for a new macbook aluminum, not the macbook air. Sorry about the confusion! My apologies if this is considered a re-post. I've done quite a bit of searching, but have been unable to find an updated, specific response to my question. I have the new unibody macbook aluminum with the 160GB 5400rpm stock drive that I would like to replace. Based on reviews, I'm leaning strongly toward the 320GB Seagate Momentus (I don't think I need 500GB unless anyone thinks its a significantly better drive). My question is whether to go for the 5400rpm Seagate Momentus 320GB or the 7200rpm Seagate Momentus 320GB. - What is the trade-off between speed and battery life/heat. I'd really rather avoid any significant loss in batter life from what I get with the stock drive. Increased heat is not a huge issue for me unless it will impact the laptop's performance. Are there any other issues with switching to a 7200rpm drive? - Is there an alternative 7200rpm drive that performs better with battery life/heat? - Finally, is it pretty easy to replace the hard drive in the new macbooks? I've taken apart electronics before, but I'm certainly no expert. Thanks in advance for any help. Also, I know I can find this elsewhere, but any quick suggestions on increasing the memory while I've got the computer open.