I'm planning on pre-ordering the iPhone 6s and I've been comparing my options (pay full retail, switch to new Verizon plan on use device pmt plan, or stay on my current plan on pay 2-yr contract price).

Each time I go through the steps on the Verizon website to appraise the value of my trade-in (iPhone 5s 64gb space grey), I get a different value. Sometimes it's $300, sometimes it's $200. I'm wondering if the value is somehow tied to my method of payment for the phone and/or the plan I'm on (2GB Loyalty for $60).

Does anyone have a more definitive answer as to the value I'd get for my good working order 5s?