I was shaking my head at first and thinking to myself "this isn't a drag racing car so wtf?" but then it occurred to me that men just have the need for speed! I do as much as the next guy.
But it also sounds like there's a couple things happening here in terms of the OP. Either he's trying to justify buying an M3 over the AMG or he's got a buddy with an AMG that keeps taking little digs at him. In the case of choosing an M3 to drive, there's always going to be faster cars so why the concern over one particular car over the other? If it's a irritating buddy, either grow some thicker skin or turn the tables and invite him to the roadcourse track.