I'd go a OS Giken or Nismo twin plate. They've got the best reputation on here in jap twin plates specs, in terms of holding the power vs gearbox stress.
No point going a triple plate - a twin will handle the power fine and be what you'd call bulletproof, with less strain on the box (with that power, take it easy into third... it still might blow though, some get lucky others don't). I've done 18,000kms in my car with 415hp and numerous launches.. no dramas here (with an ORC twin, but due to a crap friction point location, I wouldn't go the ORC next time)