Don't know how they would determine that you need new rotors unless they measured them. Even so, you can get really nice, new rotors for less than $100 a piece. A set of front and rear high-performance pads for $500 total. You could replace the brake fluid too while the wheels are off with a higher temp fluid for less than $50. So, for less than $1000, you could do the whole thing yourself. And that $1000 was a high estimate. Pep Boys used to sell rotors for $25 a piece.