As a novice, I did a lot of searching and listening to blokes on SAU that are running 350 to 400awkw + and they swear by the Nismo Super Coppermix Twin "Comp Spec" mine had the ( lightweight flywheel kit) , as a DD they say it drives like , close to a standard clutch and rated around 740HP+ if you want to turn the wick up.
If anyone is interested, I am pulling out an "OS Giken Quad Clutch" with about 4000 Klms on it, no track work but a fare few launches I was advised to change it as it is too strong and I needed something a bit more forgiving on my standard R34GTR box.