I do basically the same thing. I search for months, find what I want, try to put a lot of cash down, and show up at 9am on the last Saturday of the month. I tell them this can be the easiest sell they ever make. For example, on my Titan they already had $4,000 off sticker. I offered them $5,000 less than that and they came back at $4,500 less. I said throw in 3 oil changes and 3 tire rotations plus the optional $170 rubber all weather floor mats and you have a deal. By the way I leave my car running in the parking lot and tell the first sales person I see to go get the finance person. I am leaving in 5 minutes and we are not playing this back and forth stuff. I point out my car is running and I am leaving in 5 minutes.
Chris