I'm trying to sell my 5s because I've always wanted a bigger screen on an iPhone. It is a 32GB T-Mobile GSM unlocked phone with AppleCare+ coverage through November 2015. I was initially looking for about $550 but it seemed a bit too high since a lot of people without AC+ are undercutting the price by about $100 on Craigslist and Ebay. Some of them bought the phone a few months ago so they still have Apple's warranty through 2015 as well, making AC+ not that attractive to people on the market for a used phone right now. So is $450 about the right price to sell off the phone? I don't plan to purchase AC+ with the 6 since it doesn't really mean anything if I'm looking at yearly upgrades.