A word about resurfacing; You can not only visually inspect a rotor you need to check the surface with a dial indicator. It does not does not take much difference in two parallel surface to not have even pressure and contact. Brakes wear in and can cause a rotor to wear slightly uneven and to get the best performance out of a new set of breaks you should resurface, or at the very least check it with a dial indicator. The breaks are one of the most important devices on your car. Visually you can check for grooves and burns, but uneven surfaces you need instruments.