You're going to have to look for what that make/model are being sold for online and go from there. You'll have to negotiate, and negotiate down from the average listing prices, but it will be more than what they offer you which will be wholesale. In fact, his offer of 2k is probably what the insurance company's first offer would be.
Edit: Just my opinion, I'd be done negotiating with that guy and just report it to his insurance.
2nd Edit:
here's a link to an AutoTempest search. I plugged in your car, without the mileage, but same make/model/trim with a search of 2007 and 2008 model years. I'd use this in negotiation, as well.