Well, there aren't very many options to choose from. The problem is that most vendors end up using the SAME pressure plate and the difference becomes the friction material. Otherwise, you'll have to go street twin. I'm not sure if you can "feather" the street twin, it will be the most durable clutch to go with.
Carolina Clutches also seems to be a popular choice among c4 owners (and Bill at Zfdoc.com).