As I've said in another forum, I believe the stock brake system with track pads and better brake fluid will work just fine, perhaps with the addition of a brake duct kit to keep the temps in check.
Brake ducting is the most cost effective improvement you can make to assist the brakes in cooling. Now we just have to wait for someone to develop a system for the E9x.
Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive[/left]