Personally, I plan to go in and establish that I know exactly what I want and I know what I would like to pay, invoice plus 'my goal'. Asking for their best price first probably won't do much, since it will be higher than what your target is.
Be prepared by knowing what your invoice price is. I calculated $65,275 for your configuration, including gas guzzler, MACO, and training fees. So that should be your starting point.