If you're serious about tracking, you would want steel brakes with race pads/fluid. CCBs require 19-20" wheels, which the additional tire cost would rack up quickly. The E46 M3 track guys even use 17s to lower their tire cost and increase grip. It's better to have more tire meat for tracking.
You go through tires 3-4x faster than brake pads.
Trust me, steel brakes are more than enough if you know what you're doing. Unless you hit high speed tracks like CoTA every weekend (going from 140mph to 40mph every lap), CCBs are just nice to have.
Another catch with CCBs that BMW won't tell you, they don't work well when wet. Wet track days are more common with the odd weather we're having. Just my 2 cents.
