Biggest bang for your buck is what was said. You can do very well with Brembo "blank" rotors and a set of Hawk or Performance Friction or similar pads for
NON-street use. Is have used the AEM pads for HPDE with great results on the Brembo rotors-no warping or other nasties if you 'bed them in' properly. All out competition is a matter that you will have to find pads that work to your style while being properly cooled.
Just a note-some sanctioning bodies do NOT allow drilled rotors. Slots in my view are also useless for the most part.