Maybe you don't like F500 but there is a great car for sale on Apexspeed that Mike Brent drove, Joe Wolf drove, I drove, Nick Thomas drove and others drove to some success. I used it to learn how to drive one for one year (2006)then sold it. It is for sale with trailer and a lot of spares(see ad) for a very reasonable price. My expense was approx $1000 or less per race. My wife is an excellent cook and we sometimes slept in the trailer or back of the pickup. I bought one new set of tires and then used sets. I did almost all my own work on the car and my wife helped(she wasn't afraid to get her hands dirty) It can be done. A low cost way of getting some racing experience in formula open wheel cars.