the OS Giken should be good for 500whp, I wouldn't worry too much about how fast the clutch plates wear out, it's relatively inexpensive to get the plates replaced. You don't need to buy a whole new assembly just new plates. Carbon clutches are going to cost more initially and for replacement plates.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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