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Seriously over-simplified but....
If your rotor has a thick ridge on it's edge, it's more likely to need replaced. If it has a thin ridge (i.e. it can catch your fingernail, but it's easy to skirt over too), it almost definitely is still good if it's never been machined. Surface scratches don't mean you need a replacement unless it's super deep (very rare). A gauge measurement is the only way to know for sure.
Rotors are the expensive part - figure without rotors, you are talking a $200 or less job for a shop to do.
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99 Boxster 5spd - 64k miles
06 Civic SI - 114k miles, D.D., unbelievably reliable and fun to beat on everyday.
08 Legacy GT 5spd - 74k miles.
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