I also buy all my cars, and even my Harley like this... Point blank here is the car I want do you have it, this is the price I want it for, here is my credit card for the down payment, once you send me the paperwork to review and financing terms.
Bought my X5, rx330, cvo deuce, and my GX460 this way. Last time I went to a dealer to get a car was the Mercedes for my wife and even then I knew what I was going to pay. That was a lease...and I was dealing with my wife, a trade, and the car dealer!