I purchased the 11" MacBook Air last year as soon as it was unveiled, and as expected it was an amazing machine. However, I always knew I would upgrade if Apple reintroduced the backlit keys and added thunderbolt ports to it. When I upgraded this summer, I went for the 13" model. Now I'm considering the Thunderbolt display, and I want to go back to the 11". My current MBA is only a few weeks old. How (or where) do you recommend selling this machine? Does Apple do refunds or switches past 14 days?