The stock Z06 brakes are actually pretty good, especially for beginner drivers with stock tires. They also work real well for modified cars with pro drivers on "easy" tracks. Both Dave Farmer and I were teaching at Charlotte. He still had stock pads on his (but more horsepower due to exhaust work), and sticky tires, and I had mine in full SCCA T1 racing trim (Kumho tires, Hawk HT-8 brakes, etc.) There was no real difference in braking performance between the two cars even from 150 down to about 60 or so. The stock pads wore more than the Hawk, but the performance was virtually equal. The Hawk's destroy the rotors and the stock pads didn't hurt the rotors much at all.
Charlotte is fairly easy on brakes, like Roebling and a few others so I wouldn't think twice about using them there. They'll also do fine for most beginners on even extreme braking tracks, but once you get some experience under your belt and start modifying your car, seek Hawk, PFC, or other racing brake pad to haul you down. Have fun!!