There's also this idea from The Hack in case the plan for rotors doesn't pan out:
http://www.racingbrake.com/BMW_p/D401-01-311.htm
T-hill with JD1PT and his buddy rocked today. I'll start a thread once I get some food in me (I was downloading what I learned today to the computer from my brain/log book just now). Long day. Short story is I learned a lot (great instructor) and was waaaaayyyyy smoother and faster my last two sessions. 'Kitty improved tremendously during the day as well. And most importantly we left the track happy and ready for more.