I got the ultimate 13" to replace my 2006 15" MBP. I'm a grad student so I really like the portability, but now I'm thinking that sacrificing the power of the 13" to add even more portability, not the mention the smaller footprint considering how small the popup desks are in our lecture halls, might be a better idea. As I understand it Apple won't take back a BTO MBA so are my options craigslist and ebay? I'm still undecided about this, just trying to find out what my options are. Thanks.