I think the whole thing depends on the mission.
Agressive street/looks - paint the stock calipers red, decent pads and crossdrilled zimmerman rotors.
For the track you can go to 930/993 or brembos. I also went with the 993 brakes but also drive my car on a pretty unforgiving track.
Best advice is to start with Bill's Brake page -
http://home.nycap.rr.com/wmv/generalbrmd.htm
then decided what your long term plans are.
My brakes went from (agressive street) to track...
