Before my reservation of the Model S in 2009 and my addiction to this forum, I had a typical consumer knowledge of cars - no consideration of CG, weight, acceleration timings, power bands, ergonomics, factory visits, how cars are built etc. Currently, I am learning a lot from the discussions and the visits. So couple of months ago, knowing that I have a Model S test drive coming up soon, I decided to become a more educated car buyer. Also, since I am spending close to $100K on a car, I decided that I should at least test drive other comparable cars. Here is my list, I wonder if others have done the same or own the same cars and can share their thoughts about how they compare: Porsche Panamera Audi A7 BMW M5 Also, any suggestions on cars to test drive?