When I did my clutch research, Ram and McLeod seemed to the be 2 without any complaints. Spec, Centerforce, FRPP all had someone with a bad experience. Obviously problems can occur but I didn't find any Ram/McLeod problems. There were more people with Spec/Centerforce/FRPP clutches versus Ram/McLeod ones though.
I went with FRPP due to the price and availability from the performance shop.