I have the 16 GB iPhone 5 from Straight talk (bought from their website). It is in SUPER condition although used constantly for almost 2 years. I am confident I could private sell it for $100, which I could use for a new one. The only thing that makes me hesitate is wondering if the 6S in September would be worth the wait. If so, will I still be able to get $100 from a 3 generation old phone? I heard it will have a truly upgraded camera, and iPhone is my primary camera.