Can anyone break down the revisions for me? or more specifically, I was looking to buy a refurb FB543LL/A MacBook Air 1.6GHz Intel Core 2 Duo 120GB SATA hard drive and wondering if it has any major problems? (especially with the battery and hinges) I already have a 15" MBP C2D 2.33 Ghz but I'm starting a new PhD program in the UK in a month (im in the US right now) and thought a MBA would be more easy to port to school. It's way more expensive in the UK, so I was thinking about getting it now. Any advice? Thanks!