nice car, especially the interior. but is it gonna be the RS4 or the M3?
Alot of people have suggested that the previous C, SLK, CLS AMGs handle pretty good, ofcourse it will not touch a RS4 around bends, nor have the sensational driving experience the RS4 or M3 has to offer, however it is more one of those cars which *may* worry you a little if you're not an experienced drive, and it's lurking in your rear view.
My belief is currently the new m3 will be faster than the RS4, simply because of the newer technology and what not, the C63 amg will probably be 3-5 seconds slower than the two around the N-Ring.
However, the C63 is far more luxurious than the M3, RS4. So it really boils down to choice and general use of the car.