hi, I wanna ask u guys for your opinion. i used to have a MBA but sold it due to the line problem and hinge problem, but i kinda miss the slick thin mac. And now i have the opportunity again to get a MBA for my UMB. here's what i currently have: unibody macbook 2,4ghz 4gb ram OCZ core series 120gb ssd nvidia m9400 256mb backlit keyboard here's what i can get: macbook air rev:b 1,86ghz 2gb ram 128gb ssd nvidia m9400 256mb is it worth the trade? how will it affect the performance, will there be a huge difference performance wise? what machine is better with the new SL?