Apple refuned me all money for old macbook pro retina middle model. Now i decided to take a macbook model more powerful than old because i need a notebook (the sd slot and lightroom are necessary in this days) and middle level gaves me some slow moments. Now what is better choice: take third model (2.9ghz i5+512gb ) or spend same for middle with i7? At same prices i found refurbished 15" may 2015 but i thought wheigt can make me some problems. What do you think?