I have a maxed out 13" 2010 MBA and i'm overly tempted to move up to the latest MBA. Is this a no brainer upgrade? If the maxed out 2012 was similarly priced to what I paid for the 2010 i'd pick it up today. I don't really need 512gb and would prefer to save the 500$ it adds. The week+ delay is really whats holding me back on a BTO.