OK, after reading through this thread, which is quite funny by the way, I will help in answering the op. However, there doesn't seem to be enough information to give solid advice. I'm guess that you are in the dating phase of life or trying to get notches on your bedpost. Correct me if I'm wrong, but I'm not exactly sure where you are in your life. And it seems like you are at a point in your life where you should experiment with different people to find out what you want and what you don't want. However, you didn't ask for this, you asked for the perfect response to "Let's just be friends".
Well, she's breaking up with you so it really doesn't matter how you respond. She's breaking up with you in a nice way, but doesn't have intentions of really being friends..unless you have mutual friends. Then she means she will tolerate you while you're around, but she's not into you. I think you should have added to your response "I already have enough friends...but I could put you on the waiting list." Now that's funny and she might get mad, but you're witty.
Good luck in your adventurous voyage for finding love. And don't let the bitch shield get you down
