Hello fellow Air lovers! i feel i need extra protection for my MBA (13"), however i cant decide between a case (bottom and top speck / moshi thing) or a protective sleeve. i personally like the idea of a case - it protects the machine even when it used and i dont have to take it in and out of a sleeve every time. however, it adds some weight / bulk (although not much), and it could trap heat. what do you guys use? guide me through deciding what to get. thanks for your time!