I recently sold my iPhone 5S 16GB, mainly due to the space limit and screen size. Im thinking about keeping my next purchase for a year. Which iPhone 6 model would keep its resale value at the highest? A 16GB iPhone 6/iPhone 6 Plus or a 64GB one? What about the 5S 32GB, would that be a bad purchase when it comes to resale value? I do prefer the iPhone 5S design over the iPhone 6.