clutchmasters stage I, anymore and traffic would kill my feet.
No problems with my clutch yet, but I've only put 200 miles on it. Clamps hard and early in the pedal, it's awesome.
I suggest, though, that a clutch be one of the MUST DO mods you do. Our stock clutch is horribly crappy, it's one of the rare thigns on our car that was held back by mazda, to conform to the idea of the car, a family wagon, with a clutch of a family wagon.
Flywheel, by the way, is great as well, haven't had a chance to dyno yet, but I took a before dyno, and I will see how much it does for me afterwards, or if any at all =)