I would install new brakes - and that's not because I sell them. The fact is is the #1 safety equipment on your car. Why chance injuring or kiiling yourself or others to save a couple of bucks.
Even using new rotors with used pads is a bad idea as the two components won't mate each other properly and in fact can initally give you even WORSE braking than before, until you cause one of the components to conform to the other - which itself can cause warping and other issues due to uneven heat input across the face of the rotor.
Think about it.
