16. Chevrolet Corvette C5
If you want the maximum power for your money, the Corvette C5 is the car for you. You are probably familiar with the Corvette and its fifth generation. It is a V8-powered, fiberglass-bodied, two-seater sports car with fantastic performance, great design and everyday usability. In base trim, the C5 Corvette has a 345 HP motor, which is more than enough for a thrilling ride.
Add great handling and driving dynamics to that, and you will have a clear winner for the best sports car under $20,000. There are many C5s to choose from, so maintenance shouldn’t be a problem.