I never knew about this thread. I will definetly put a good vote in (5/5) for Chapman BMW in chandler arizona (used to be in scottsdale and moved) One of the largest dealers in the country.
Sales-Karl Muik-he races an e46m3 and has owned every m3 version ever built during the years. Good guy and gives a fair price. They also did a really kick as detail on the car when new-not a swirl or scratch or anything which is rare.
Service- Tony delsavo (actually many of them are great) but no nonsense, no nitpicking, quick etc. Have a great showroom and lounge so its fun actually sitting there for a quick service.
If in AZ I would reccomend them!