We are Disney fanatics, and we love staying on property ---wouldn't consider it any other way. So, if you are the same - stay on property. As you can see in my ticker, we'll be at CSR this year.
However, the room sale just ended, so you'll be paying rack rate as of this moment. You would likely do better price wise off property, and as the PP posted noted, there are a few place around the Downtown Disney area.