I agree with Edo. Where I saw gradual increase in performance from different pads I have tried, the Carbotech Panther Plus was a dramatic increase in performance.
We have the Panther Plus available for sale at discounted prices:
http://www.scienceofspeed.com/products/braking_performance_parts/NSX/carbotech/
If you're interested in a track-specific pad, the Panther XP compound is a new release, here's a copy and paste from a previous post...
The Panther XP has a peak friction coefficient performance of PFC 01 level, which makes the pad one of the best pure road racing compounds available. What makes it better than other track-specific compounds I have seen and tested is:
1. much broader operating temp range (225-1450F) (than other race pads)
2. much more rotor friendly (than other race pads)
3. thermal degredation is better (less cracking of the puck) (than other race pads)
Keep in mind that with any high performance track compound, your tires are as important, if not more important than the pads you select for effective brakings, especially if you use stock width wheels.
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Sign up for the Northwest NSXCA Track Event at Thunderhill:
http://sacramento.nsxca.org/Events/thunderhill_driving_school_4-02.htm
[This message has been edited by ScienceofSpeed (edited 20 March 2002).]