FWIW, on my "other" rabbit (gasser GTI autox car), I went with a six-puck clutch disk sourced from BSI Racing. When I got it, it was in a Kennedy Engineering Products box, so I suppose they're the ones making them.
The disk I have is some sort of kelated copper ceramic material that's really tough. It took some getting used to / bedding in, but it's been great. It's definitely more on/off than the stock setup, but combined with a 16V pressure plate, I haven't had any problems with it in 5 years of hard race abuse.
I went with the six-puck over the four puck because Stu at BSI said that the 4 puck was less brutal / easier to drive for street use than the 4 puck. Not sure... I've never had one.