ED is an awesome expierence, I dont think I ever read or heard of anyone who went coming back and saying "wish I didn't do that". Everyone who goes seems to really enjoy the whole trip and enjoy thier cars that much more. When you go on ED you have a story for life and in a way you become more bonded to your car because of the trip.
other option is you could get a used individual M3? There is a really nice one for sale in the cars for sale section