How much could I sell my iPhone 4 16GB for?

I'm looking forward to buying an iPhone 5 when it comes out, so I was wondering how much I could sell my iPhone 4 for. It has only one minor scratch that you can't see, unless it's in the sun, on the top left corner of the phone.

$173

Tiffany your stupid btw about 200 dollars

Prob 200 without a contract, but just keep it to trade it in for the new iphone or whatever phone you want.