Yo lemme holler at you for a second. The reason cheap people like me picked the 550i clutch kit is because it's cheap.
If you are going legitski power, go legitski on the clutch. Two things to consider - the car wasn't meant to be a 500hp/500ft-lb daily driver, so asking for a setup to retain the daily driveability (is that even a word?) is a lot to ask.
My recommendation for you is the following: ACT 6puck sprung/extreme PP (or whatever they call their high performance PP at this point.) Mate this to an ACT SMFW- You'll have a mild amount of chatter, but you won't have to worry about this setup for a long long time, and it will destroy your tires and transmission before it destroys itself.
;]
http://www.advancedclutch.com/bm8-hdg6