Don't forget to replace the caliper bolts. Porsche recommends that they be replaced if they are removed. Part 999.067.041.09 and they should be around $3 each, you need 8. Use a M12x1.5 thread chaser to clean the threads on the wheel carriers. Torque to 63 ft-lbs.
Also, the spring clip and retainer pins need to be replaced- again, Porsche recommends it. The repair kit is the same for front and rear- 996.352.959.01. You need two kits and they are around $50 each.
Double check those part numbers for your model year.
Your quote of 480 for rotors, pads and sensors seems reasonable.
Regards,
derb
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