I shopped around for some rotors a couple months ago, give these guys a try:
http://www.frozenrotors.com.
People say the cryo treating does nothing, but so far these rotors have worn outstandingly well. I think they can also get you prices on non-cyro rotors as well, brembo blanks or whatever. I did quiz them a bit about the centrics, they said that they have tried them on some vettes with mixed results, they instead recommended using a premium NAPA rotor or a brembo blank instead if going to go for oem replacements for track duty as they seem to hold up to prolonged heat cycling better without warping.
Give em a call, these guys are local, have a tons of track experience, good prices, and great customer service.