I now run i-Rotor slotted and drilled rotors (great banf for the buck) and the Porterfield RS4 street/track pads, ss lines, and ATE "Blue" brake fluid -- very consistent stopping, modulation, etc.

I looked at the StopTech big brake kits, can get the 332 mm 4piston one under $2k, but they don't fit in the stock wheels, and I don't like running spacers.