What do people think about this model: Apple 13.3" MacBook Air 1.86GHz, 2GB RAM, 128GB Solid State Drive, NVIDIA GeForce 9400M - Aluminum unibody (MB940LL/A). Selling for $1299 (post rebate). Can get for $1260 after Bing Cash Back. Seems to be the REV B MBA. I would think this is preety good compared to Rev C version. BTW, what is the main difference between the Rev B and Rev C MBA? The only thing I see is that the 1.86GHz model went from the top of the line to bottom of the line in the Rev C models. Any opinions? Thanks.