Try ITG if there's a machine near you. It has a lot more to it, but it was sued by Konami. You'll be lucky to find a machine, but if you do, you're in luck. There are still tourneys held around the nation for ITG, and you should definitely try the next time you encounter one.
Btw, do you own any DDR's or play on a specific machine? I know most of the Extreme songs, but haven't really gotten into Supernova yet.
Hardest song I can pass on ITG is Delirium on Expert.