A couple members on here installed the Power Stop kit with the drilled & slotted rotors from RockAuto.com. They report really good performance from that. I have Power Stop Z23 pads and Raybestos coated rotors installed on the front. They perform really well. There's no need to replace the caliper unless it's sticking or damaged. You definitely want to check the guide pins and make sure they're properly lubricated and moving freely.