Score: 6.6 / 10

We love the Mercedes-AMG C63 S Cabriolet for one reason and one reason alone: that twin-turbocharged 4.0-liter V8. With 503 horsepower and 516 pound-feet in the "S" model, the C63 Cabriolet is like a droptop rocket ship on wheels. But the AMG also gets high marks in safety, even though that equipment is a pricey extra, and it does look nice. The AMG C63 S Cabriolet gets 6.6 out of 10 stars on our scale.