Dang, I've got a mid 2011 11" Air... I've contemplated getting the 13", but with the new 13" Retina Pro, I might do that instead...
Either way, good luck with the sale. Last year, I sold my Jan 2011 11" MB Air to a girl for $800. It was damn near perfect and it only had the 64GB hard drive. I think your price is pretty fair. Although, it might be more appealing if you update all the software. I'm running Mountain Lion and like the changes. Also, you should list any third party software...
GLWS.
2011 E90 Lemans Blue/Bamboo Beige M3- Harrop Supercharged IG: lmb_zcp
2013 F25 Alpine White/Chestnut X3 35i- Family Hauler
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