I'm in the Houston area and I bought my current Navigator at North Park Lincoln in San Antonio. I have experience with three Lincoln dealers in Houston (Planet Lincoln, West Point and Bayway) and they were all varying degrees of difficult or slimy. Of the three Bayway was the slimiest, West Point was more subtly dishonest and Planet Lincoln was more difficult than outright dishonest. Life is too short to put up with these *******s, and San Antonio is not that far. I cut my deal online, drove up on a Saturday morning, had no nasty surprises at closing and drove home right after lunch (which the dealer paid for so we could pass the time while they detailed the car a little more).
If you do a search for similar threads in the past, you'll see several other people saying positive things about North Park Lincoln. My most recent experience was far enough in the past that I don't have a contact there. The only negative thing I can say about them was I told them not to put me on any spam list but they still did it and sent me a bunch of spam emails for oil changes and other maintenance, even though they knew I'm in Houston and wont be using them for maintenance.