If your buying a $45K+ car then the dealer likely had 3-4K added in the price of the car to cover your trade. Makes it look like your getting the most for you trade. If you negotiated from dealer cost up instead of sticker price down, got a good price and are still getting 18K for your trade then you did great, let the dealer have the car and enjoy your new ride. What are you buying that would make you give up your low production Roadster SRT-6?