I need to replace the front pads on my '06 G35. The OEM rotors are producing some vibration while stopping from higher speeds. Is it still possible and reasonable to machine rotors provided they are within spec? I'm going with Centric pads and new Centric rotors for the front are about $90 each. Machining is about $15-20 per rotor but my concern is with less material on the rotor after machining, they won't last for too much longer.