I think you need to revisit your reasons for buying the car at the outset. I've never understood why anyone would buy a decent car to primarily drive it in the urban environment. Isn't all the fantastic machinery seen in central London just to show status rather than to exploit the performance? Take yourself on a trackday in your Z4MC and see if you need a performance car in your life or decide whether you've now scratched the itch that made you buy the car and decide whether a runaround will suffice for your needs for personal transport.
