If you don't have enough coin for the Tesla Roadster, but you want a cool eco car, why not get a Human Car? The Human Car is a quadcycle that's equipped for high speed.
The company claims, "Several downhill time trial runs have had the car above 60+mph with incredible handling and BodySteer® characteristics."
So, next time you are looking for something to take you to highway speeds, remember that your vehicle of choice doesn't need to be a regular car. BUT, I think you'll need a pretty big hill to keep it fun.