Call Tobin at Kore3. His front GM Big Brake kit with C5 PBR calipers, slotted 13" DBA rotors (if still available) and Hawk HP Plus pads will surprise you. For street use I have plenty of brake and they should handle moderate 20 minute track sessions. I'm running a 7/8" master and can chirp the fronts at 35 mph with a quick stab of the pedal. I would rate the modulation as similar to modern day street superbikes or very good IMO.
www.kore3.com
My 200 tread wear tires exploited the antiquated stock front discs, with this front brake set up I don't have enough tire.