Audi RS 6 Avant. Nearly as fast as a Nissan GTR or Porsche 911 Turbo around a track. Beautiful, luxurious interior. Clean, aesthetically pleasing but unassuming exterior. If I needed to own one car, and one car only, this AWD super sleeper wagon might just be it. I can't think of another car that could handle a combination of road trips, track days, snow days, and the occasional furniture purchase as well as this. A true masterpiece.