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With respect to turning rotors, you can have them turned until they reach the minimum specified thickness set by the manufacturer.
Seriously, the effects of running a rotor past the min thickness are: easier rotor warpage, or if they get too thin, they could break (literally) apart.
I not sure why some mfg recommend changing rotors with each set of pads. But that qould get awfully expensive awfully quickly for me. As I tend to go thru brake pads like water, between track events and auto-x's.
Good luck with your decision.
Oh, as a sidenote, I would avoid cross-drilled rotors if you could. Unless you like the bling bling factor. I'm not gonna get into a technical discussion here. But as an example, I can't think of one race team or series that uses cross-drilled rotors on their cars.
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