Stick to your price. I spent a lot of time researching used Model S' last year and purchased one on this forum. The price was on the high side and several thousand more than other P85's listed at the time. The condition and the warranty matters. People are too focused on the price and gloss over condition of the car. My friend was a bargain shopper and bought one of the cheapest P85's listed on the forum just a few months after I purchased mine. Our experiences couldn't be more different. I've had few problems with mine. Transaction was easy, best car I've ever owned. His car broke down on the 1200 mile drive home. He had to fly home and had to have the car hauled back. He had to pay several thousand out of pocket to cover repairs not covered by warranty. In the end, we both wound up paying similar costs out of pocket.
It sounds like you have a floor price and if you're still happy driving the car, just drive it. You have a good bargaining position and you have a good idea of what your options are (carmax, autotrader, etc.).
