I got a used 2010 model for $900 (i5 2.53 arrandale, 8gb ram) in perfect shape with over a year of applecare remaining on it off ebay. With the money I saved I will pit in an SSD and it will be super fast. For most people the cpu makes very little differance, unless you game the graphics makes very little differance, thunderbolt is pretty much useless, usb 3 is great but there really arent many devices (inexpensive ones anyway) that take advantage of the extra speed (yet). So basically unless you game or do cpu intensive tasks (in which case a laptop isnt really ideal anyway) I would get an older model (either refurb or used) and pit an ssd in it. As for resale value the cheaper machine will probobly lose less money because by the time you sell it the retina style models will have replaced these models and all of these models will have depreciated to similar levels due to being last generation