If you can only buy one M car… this is it! Turbocharged four-cylinder boxer replaces the six-cylinder heart. What else? Have a large family and have an equally big urge to drive. We test two sweet people-movers and pick one to buy. Lamborghini Huracan Spyder, Mercedes-Benz S63 AMG Coupe, Land Rover Discovery Sport, Lexus RX 200t, Nissan NV 200 and so much more.