Nicole- my breeder of my two borzois did what I did.
With my shepherds I did 1/4 purchase price back for obedience title over CDX ( easier for a shepherd to get than a borzoi... lol) and half price back on Championship.
As far as OFA, I required the dog to have their hips done. Afterall- its to not only insure the health of the dog, but also verification to you that your puppies are clear/ or good in hips. Also- I guarrenteed against hip displasia because I knew my dogs were clear, but if a dog did come up on hip problems, they didnt have to return their dog. They could keep their dog, as well as a replacement puppy.