I'm trading my baseline 13in MBA (2012) +80$ for a 2.2GHZ Early 2011 15' MBP 4gb ram and 750gb hdd no applecare. from purely a price stand point is it worth it? Am I breaking even? I just don't want to be at a loss. Also how fast is the price devaluation for the 2011 MBP at this point? Thanks!