Just Imagine a Cayman R with the GT3's engine (435-450hp), even lighter carbon fiber frame, wider sportier tires / brakes, etc....
Talk about a 911 killer.. but then again it bascially already is if not for the inferior power train.
Personally I'd just go with a base Cayman or Cayman S for a daily driver. The R is awesome but I don't do much racing.
This new BMW 1M coupe is pretty cool as well but I don't trust that turbo engine to be super reliable.