I always wonder why people who like the M3 and its driving dynamics push AWD turbo cars. What makes the M3 great is the RWD platform and its high revving and responsive N/A engine. The only real upgrade to me would be a GT3, not a 911 Turbo or GTR, if I was looking for similar characters of the M3 only better. Of course there's Ferrari, but that's another story.
Seems like most people base their car purchases on magazine performance numbers over how the cars actually drive.