I can buy an iPhone 6 for roughly $100 and only need a "loaner" for 6 months. Then I hope to buy a cheap X or XR when the new iPhones are released in September. Is the iPhone 6 the best bang for the buck in terms of me not losing any value? Even with a terrible trade-in to a carrier or the Apple Store, the iPhone 6 seems to be trading for around $75. If I go the Craigslist route, I could probably break even.