If you dont need the space ditch the m3(I dont belive what I am saying, it is an insain car)
In norway a loaded z35 is 170 000 usd and you get a cool 997 for that. Its hard! the 911 probably is a better sportscar and z4 a better cruiser.
What are you looking for? The z4 will probably draw more attention than the 911.
miss it