Lets be fair the M3 is about all round driving ability, the Cos is about straight line speed. Get a sierra saff which creeks groans and moans or reliable comfortable and quiet till you wind it up Beemer. It ain't the fastest in a straight line(although 280 as standard is easy enough to see off a standard Cos), but overall it's a superb car. I hated BMWs image, but once I drove it, game over. Park up a saff next to a M3 and look at the difference, know which one I'd rather go home in