Hey everyone. I am wondering what I am losing gaining, if I were to switch to a MBA, in terms of speed and performance. I do not need more then 128GB storage. I bought my MPB in December 2009. My 15.4" MBP specs: Intel Core 2 Duo (Penryn) - 2.53gHz 4 GB (2x2GB) PC3-8500, DDR3, SO-DIMM 250 GB, 5400 rpm NVIDIA GeForce 9400M - 256 MB Thinking about buying the 13" MBA 1.7GHz dual-core Intel Core i5 4GB memory 1333MHz DDR3 128GB flash storage1 Intel HD Graphics 3000 Also if anyone has an idea of what my MBP is worth and I could sell it for that would be appreciated. Thanks for the help!