I'm in the market for a new MBA 11.6." I'm wondering what is the most effective upgrade to the base 11.6" MBA. I suppose I mean "effective" in terms of performance, speed, longevity, etc. If you could only pick one, would it be: 1) RAM: 2 to 4 GB 2) SSD: 64 to 128 I plan to use the MBA for average web (pandora, facebook), iTunes, iPhoto, and Office (LOTS of writing...I'm a grad student). I also own a 13" MBP, which will be handed over to my wife. I plan for the 11.6" MBA to be my main machine. (Slightly off topic...is it reasonable to expect that, coming from the 13" MBP, I can use the 11.6" as my primary machine? I'm a little worried about the smaller screen.) Thanks.