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The rotors on a Boxster are not designed to be turned. They are replaced after 3 pad changes on average according to my mechanic.
If your current shop wants to turn them, they don't know that these rotors don't brake well after being turned. I would say that's a fairly good indication that this shop shouldn't be working on your car—they don't seem to know what they're talking about.
You should replace your rotors with similar ones if possible... you could always upgrade to the cross-drilled if you like. I've investigated them and found that they don't wear down pads any faster than non-drilled ones do, but do stay cooler and allow you to reduce brake fading.
What you want to stay away from are slotted brake rotors. These are designed for racing and shave a bit of the pad off every time the brakes are applied so the rotor is always in contact with fresh pad... they'll wear out a set if pads quickly if you use your brakes in traffic and your car on a daily basis.
I'd say that you should have someone who works on Porsches inspect your rotors to tell you if they can tolerate another set of pads or not. If they'll do the work for you if you supply parts like my mechanic does, that's the way to go. You get the right parts (the mechanic tells you exactly what to buy) and you'll pay bottom dollar for them with no shop markup.
FYI— I will have slotted rotors installed with the next pad change on my 1997. I want that S look and the better braking too... I'll paint my calipers red at that time as well to complete the look.
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