As far as drilled or slotted brake rotors for the street (the original question), they look cool but don't do much else. Even in upper levels of racing it is something that is not really very popular anymore. There are a few applications where the brakes are critical and space constraints are small where it has a small effect (read NASCAR cars at Martinsville). Slotted rotors are just as effective as drilled rotors at a fraction of the machining costs. The brake gurus (Fred Puhn, Caroll Smith, etc.) all think the eccective way to slot is two groves across the rotors, one of each side of the hub, simple and as effective as anything else.

As far as pad selection, read this:
http://www.stoptech.com/whitepapers/...otors_myth.htm
written by Caroll Smith. I do believe in his recomendations in the article about pad choices.

In autocross full race pads will not work, but any high performance street pad is going to be fine. I like the Porterfield R4S. I think this is a pad that you can autocross, drive on the street and get away with at track events if you have good cooling, good fluid, and a fairly lightweight car like say a Civic, Sentra, or first gen RX7. If your car is significantly faster or heavier (say a 3rd gen RX7 or Mustang GT) you will have to change over to a better pad at the track. I have used the Hawk HP+ pads and think they are good. Phooka uses a Carbotech pad with success. Most of the pad manufacturers that stay in business any amount of time are producing a good product.