Oh yeah.. if you do decide to re-use the old pads with new rotors (extremely bad idea if you ever REALLY have to use your brakes) make sure you sand the pads to eliminate as much channeling in the pads as possible and to get rid of the glaze, then go "seat" them. Go find a big empty parking lot and do about 10 progressively harder stops from about 30mph on up to 60mph to match the pads to the new rotors somewhat.

Seriously though, spend the extra $40 and buy at least some new OEM pads.