I personally use the following:
Mugen flywheel
Dynamite Max Life clutch shoes (they don't mushroom as bad as most, so they don't need to be "cleaned up" or replaced as often)
Mugen or Racers Edge Vented clutch bells.
Mugen or Kyosho 1.0 springs.
I like those because they work, and are readily available at my local shop. I've heard good things about the Werks and Fioroni clutches too though... the nice thing is they are adjustable.