i would go for the bmw, c32 are cheap for a reason, they are far from drivers cars, too much nannying.
E46 m3 with good spec, just be sure all the maintenance has been done, since there has been some engine problems, friend of mine had 2transplants.
It is like eating the cake and having it. Since it is fine/comfortable cruiser for 4 and still a good sports car for the B route.
http://motors.listings.ebay.com/_W0Q...e=search&fgtp=
M3s that are at ebay at the moment, if you hadnīt checked em out.