the w-body rotrs seem to be lasting ~40k miles before warping from everything i have been seeing posted. mine (2004) went about 42k, and are just starting to pulse around 78k. Look into some after market slotted rotors, they'll run you about $125/set (fronts) $200 for all 4 IIRC, but seem to be lasting longer escpecially if you get them from a company using good quality blanks