I've got a '98 Tahoe with 95K miles on it. Ever since I bought it used (65K miles), I've had to have the front brake rotors turned about once every 6-8 months to take out what I believe is warping due to heat. Once the rotors are turned, the brakes stop nice and even with no pulsing, but over the course of several months, the pulsing comes back. I live in a cold climate, but do mainly city driving with lots of stop and go. I've been wanting to replace the rotors with something that won't warp as fast, and have been looking at either slotted or drilled rotors. Two questions - 1) is this a common problem, and am I on the right track to replace the rotors with heavier-duty ones, and 2) If I do replace them, what type of rotor is best (standard, drilled, slotted, etc.)? Any advice would be appreciated.