Ok, what's your take on ZIMMERMAN? They finally have x-drilled replacement rotors for just the rear for the E46 M3. Also, is it ok to mix and match brands? I was thinking going w/zimmerman rotors for the rears and the Euro OEM floating ones for the fronts? (FYI, the zimmerman are sold at www.bmpd.com for $79.95 each for the E46 M3)