hey well i suggest winning the camaro race car and then give it some more hp then go run it through super speedway endurance until you get that corvette or the f1 then your set for a good while...
The Panoz Esperante GTR-1 is a great car with a little work, the racing skylines are good too (most of them are 4WD you'll notice and handle considerably better). i really need to try this Vertigo car.