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OP do you have any friends with either a spec or a centerforce? If so, go drive them both and then make your decision..... It will be easy LOL. Every spec I've driven sucked compared to a Centerforce DF
Driven a centerforce df and a car with a spec (dont know what stage but it was on a bolt on only car), the centerforce is like butter and the spec seemed to grab hard and had more pedal effort than the centerforce. Just my experience though. But for a single disc, the centerforce is the way to go. Twin disc, McLeod or maybe SPEC, but havent heard a whole lot about spec's twins yet.