The Exedy Hyper single has a lightened chromoly flywheel and aluminum clutch cover, available in single or twin disc.
This is Kohr's "Go to" clutch for road racing. It's what I and many others here use....not sure if its the best but it works.
I had one of these in my car for a year before finally ditching it. Nice piece but not much fun for street driving as it's much harder to modulate from standing start. If you are running a dual purpose car I'd personally skip it.