The brain says Z but the heart says M. Yes the Z is more powerful and will be easier to maintain, but the M Coupe has so much more character. The odd yet cool styling, the two toned interior its just amazing. Its handling and acceleration are on par with the Z, but everything else about it is a step up. Easily the funkiest car we have seen in a long while.
http://www.vf-engineering.com/
VF supercharger is the way to go.