If I had to do it over again, I would have gone for the new 911s or 4s. The M5 is phenomenal, but I personally would enjoy a smaller, more nimble car. Traction also should be a commodity now days with high performance and what better than AWD?
Present: '14 S550, '13 Carrera 4S, '11 E550, '13 RAM 1500
Notable Past: '13 M5, '11 Range Rover Sport Supercharged, '08 CLS63 AMG