I'd bet a little more than that. Maybe $200 if its in good condition--but that's assuming the price of the 3G iphones will be the same. If they come down in price that will affect the resale value of your current iphone. It seems even the non-technical public is getting a sense of something better to come. On a recent visit to the Apple store I heard a few Apple store employees telling potential buyers to wait for the next version. Steve Jobs would scream if he heard that. lol