I just recently bought the Arizona z car brakes, and I too was also trying to figure out which ones to buy. I went with azc due to the rotors being the only difference out of the two. I am happy with my decision.
I have a s13 blacktop with metal head gasket, 765cc injectors, Brian crower 272 cams with full valve train, meth injection 3.5 exhaust, isis intake manifold, power fc also
Well my car is gonna be a weekend cruiser with the occasional track day so i didnt want anything to soft her recomended 5k in front and 6k in the back since i am doing a sr20det swap but i went with the 6k front and back. He also told me if the setup was to stiff he could get me others but for me to just call him.