Hey Steve, do you go hunting for clutch topic threads?
Ting, Madaz is right. NPC are good clutches and best do it right, do it once. I've had Exedy and Extreme clutches in the past, but I find I hear good things about NPC and Nismo.
I've seen Exedy and Extreme clutches die on the track, but my Nismo kit has gone the distance so far in a 204awkw 1650kg Stagea.
If you can afford new, get NPC.
If you can only afford second hand, find a Nismo HD kit from JIS or JMS, but get the flywheel machined ($90).