Looking for a laptop for video/photo editing in 13" screen. While I really like the new Retina screens, the lack of future updatability concerns me. Right now I can get the current cMBP for $999 in its standard configuration and upgrade later (RAM, HD). The other option is to suck it up and purchase the midline rMBP for $1549. Is this a wise purchase or am I going to regret this down the road when the non-retina MBP gets older?