So, I choose the M5. Did ok, 2-3 seconds off the top E46 M3 on R-compounds. In a night run, I ran with 4 people in the car. Got a 55.3 or so, fastest I had was 54.4, so that was a good run. the passengers got a lesson is weight transfer. Car was probably near 5000 lbs then. Handled great! Also drove an AMG E55, BMW has nothing to worry about with that car
Lesson 1, foglights are easy to break, especially on M cars. First time that I had broken one, but it is common. All the M5s at the Performance Center have busted fogs