Hey all,
I think that some people are losing sight of what is right for their car. Clutches are like horses for courses - you gotta have the right set up for the intended use. Being able to handle the power output is one thing, but how it's being used (street, drag, drift, curcuit) as well as the actual weight of the car comes into play also. It's no good putting a 600hp capable clutch into a 1600kg car if it can't handle the intial torque transfer to get the car moving.
Part of this comes from the friction material used and the clamping force of the pressure plate, as well as the way the clutch engages. It's why factory clutches last quite a while (even some abused examples) as they are matched to the intended use.
Just something to bear in mind...