I'd go for the V8 Supoercars, not the Champ Cars...

Last year when i went and watched a day of the Indy and V8 cars up there, it was great.
The V8's are good because you support the brand, or a particular driver, so itsa more entertaining and the rivalry, etc.
But to see the champ cars in action really is something else.
The noise of the things, when they're coming onto the back straight and going full throttle, is absolutely amazing. Plus the noise when they're changing gears, sounds like something just exploded. Its great!
Of course, with most things that are quick, you have no perspective until you're there watching them, from the other side of the fence.

cart and irl are talkin of joinin soon like it used to be, so someday america will have a racing series that rivals F1