You do not turn Porsche rotors at all. I purchased a set of cross drilled Balo's and Mintex pads for under $300 from Pellican Parts. This is a DYI project and is very easy. Also, flush your brakes with new fluid. My 2000 S had 68K on the clock and the rotors looked and felt good. But, when I stopped I had a kind of rubbing feel in the pedal. A set of 10 year rotors lose there smoothness and the rotors become a little brittle from all the friction generated by stopping. Now, there perfect, just a very smooth stop.
