what are your plans for driving in the winter/snow with the 21" wheels? with the amount of potholes that i encounter (we get freezing and then hot weather, so it's tough on the roads), I would figure that having 19-20" wheels with bigger tire sidewalls would be advantageous. If i switch my order to the performance, i'm debating investing another 3-4000 on a winter tire/wheel set.
also, with the spoiler, i've read a lot of threads about the spoiler keep peeling off (since it's only heavy duty 3M tape that holds it on.