Here's something interesting. www.onecryo.com and frozenrotors.com both have cryo units that can cryo temper your rotors so they DON'T warp the day you get them. frozenrotors.com also does slotting and cross drilling, so you can send them blanks. Prices range from $35/rotor to $56/rotor (depends on who you have freeze them). Cross drilling/slotting is $45/rotor. I'm not advertising for these folks, but after reading up on the process, as well as talking to a metallurgist (friend of a friend), the process really makes sense, and doesn't sound fly by night at all. Just an FYI for those interested. I know this is what I'm doing when I spring for the SPMotorsports kit.