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with 500 rwhp I wouldn't go with anything less than a Spec Stage 3. Most vendors have them for 330-350 bucks. You could also look at centerforce dual friction clutches, ACT clutches, etc. I have the most experience and have researched the Specs the most so info on the other brands is iffy. The Spec stage 3 is a nice clutch with a decently light pedal effort (considering its a performance clutch). They do have a little bit of chatter to them when they're new but that fades as the time wears on.
Coming from most of the Cobra owners I know (thats mostly who I hang out with o what i concept now I have a blower) Spec makes a good clutch as well as DFX who makes the centerforce clutches