Centerforce Dual Friction (Diaphragm Style) Clutch Kits

Thanks everyone for the insight. I will probably give a call to Centerforce, RAM, Mcleod and possibly a few others and visit with them as well.
i too am looking to buy a diaphragm clutch i've decided on either the mcleod super street pro for 375 or the centerforce dual friction which sells for a little over 500. doe's anybody know why the differance in price they are both middle rated 400 to 500 hp street clutches. i have no experiance with either one. have you decided on a clutch yet?