How much is a 32gb iPhone 4S worth?

I have a white 32gb iPhone 4S on the Sprint network. Everything works fine except for the Wi-Fi and the phone only has 1 small scratch on the bottom left edge which is barely noticeable. I've always had it inside a case so it pretty much looks and works like new. The fact that the Wi-Fi doesn't work is my only concern. How much do you guys think it's worth?

$180-$230? Maybe

At least, $200.