in my 03 i have Powerslot + 1 in the fronts, Powerslot rotors in the rears, Hawk pad all around and goodridge SS brake lines and i can tellm you it does the job real well and i 22" giovannas. it made a big difference to me.
do you have these on your ladey with the stainless lines, I would assume cermaic pads would be the best to use. What brand? Hawk? EBC ?the front powerslot kit comes with a bracket that pushes out the stock caliper for the bigger rotor if you do decide to go this route get everything (front & rear rotors, good brake pads & stainless steel brake lines) cause i have a friend that just bought the front kitfor his escalade and it didnt make that much of difference compared to mines.