Just curious but, are you replacing it because it's warped, or grooved? If it's grooved, I had that same problem when I was using the sintered pads, they're the hard ones that look copper in color, they wreak havoc on the rotors. I replaced my pads with the OE
style organic pads and not only did give me a better pedal feel without the easy lockup, but they polished out the grooves after a few weeks. Just a thought because, as you've probably found out by now, replacement rotors are super expensive. Realistically, a rotor should last well over 60k miles. Something to consider.