BMW 650 Convertible Passengers: 4 Suitcases: 1 BMW has officially unveiled its all-new 6-Series convertible at the Detroit Auto Show. The 6-Series will initially be available in 640 and 650 variants, with power ranging from 320 to 407 horsepower OTHER CHOICES Corvette Grand Sport $259.00 per day $1,499.99 per week Porshe Carrera $499.99 per day $2,999.99 per week