I just got a quote on the above referenced 2009 M3. It would be almost 2K a year, and I have a perfect record and over 32 so does my wife. Right now I pay $1750 for two cars per year (incl 2008 X3). If I was to add the M it would be $3700 with 2 drivers and 3 cars. Germans require astronomical liability limits like 7.5M Euros BodilyInjury / 1.0M Euros PropertyDamage /500K Euros Consequential Loss per car. OSTEOME was right, it will go up double.
2011 E90 M3 Frozen Black