You might find that the pressure plate with that more expensive kit is only rated to 1050kg (2315lb) and it might give a light pedal feel still, as it's not very heavy. How ever, with a low rated pressure plate & aggressive clutch face (button), you wont get the same clamp force as with a heavier pressure plate with a tamer clutch face (organic mix). My clutch has a 1633kg (3600lb) pressure plate with a carbotics (carbon, steel & others mix).
Give jim a ring and have a yarn with him.