At full chat I bet the 4.0 boxer sounds the best as well especially with the optional exhaust. The others just all seem like one trick pony town centre traffic light GP showing off machines to me.I'll take the Cayman. They all have very similar acceleration in the real world (even the Golf R), and that gets boring very quickly.
I was surprised how they're all pretty much together at the mile, the AMG must have the aerodynamics of a barn.