Yella Terra Light weight billet steel flywheel in mine with Spec Stage 3 Copper ceramic button clutch.
http://www.specclutch.com/cars/Chevy/Camaro/2000/Single
The flywheel is about 7KG versus 10.5 for the factory jobbie. The clutch is a little agressive in it's take up but quite drivable. I've heard reports of clutch shudder till they are bedded in but I never experienced any.
The design is very similar to the Textralia clutch but I bought this setup before they came out.
Yella Terra did me a good deal on the flywheel and it's a very nicely made piece.
I got the clutch and pressure plate through CAPA. They had them in stock and the shipping from the US was a bit prohibitave (probably worked out about the same price).
I got the flywheel and pressure plate balanced together as a unit before fitting it. This is very important. I also used a set of ARP flywheel bolts.
I hear the LS7 clutch is pretty good if you want a factory setup.
Cheers