I'm looking for a computer that can handle fairly heavy Logic Pro use and live audio processing in a program called Max/MSP. It'd be a nice bonus to be able to play some games like Bioshock or Batman (at even the lowest graphic settings), though I am not buying it for this reason. Overall cost and price to performance ratio are the driving factors for me. I would prefer to have this computer be capable of my audio processing needs for the next 4-6 years. According to Geekbench, the refurbished model crushes the new 13". The cores are basically equivalent, so the 15" is almost twice as fast. I know I will need 512GB of hard drive space, but admittedly, a lot of what I have can easily be moved off into an external if need be. Is there really much of a difference between new and old retinas besides the battery/temp. performance? I know the processor speed increase is pretty negligible. Are the new PCIe SSDs significantly faster than the previous mid-2012 model? I tried to look this up and got confused results. Furthermore, would a major difference in speed effect my usage much? I'm guessing no. The battery life is important to me, but for various reasons, I would almost consider the screen size more important. I'm leaning towards the a refurbished 15" retina (Feb. 2013) with quad 2.4/8/256 and the 650M card for $1659. Your thoughts are appreciated.