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Rotors are just metal so cheapies usually perform the same way as the others. Where you can have improvements is in cooling for track use such as having curved vanes in them etc.. Those drilled holes are just for reducing the weight of a rotor and only crack at the holes prematurely. Rotors can have coatings as already mentioned like zinc (galvanizing) on the rotor hats that keep the hats from rusting. If you are not tracking the car just buy the cheapest rotor you can get as you will never know the difference. It is best if you know how to properly bed the pads in as improper seating right after you put them on is what warps rotors and creates problems. Essentially you need to get them through a few heat cycles without coming to a complete stop (if you stop completely is when the pads will warp the rotor) Just find a good road that you can get the car up to speed and stop hard a few times without coming to a full stop to get heat in the rotors, do this for a couple times to get some heat cycles through them but do not stop just slow and hit the gas again. Once you have done that a few times drive for a little bit to let them cool off again and you are good to go.
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