If your dogs are champions, why do you need to ask on Yahoo Answers? If your dogs are champions, why are you trying to sell puppies off of YA? You should already have people lining up, offering you deposits.
Breeding should only be done to better the breed. Producing pups out of the same two parents over and over again isn't bettering the breed.
Will your dogs have show titles or other sort of titles?
Will you do genetic testing?
Will you do testing on knees, eyes, hips, and heart?
Will you get multi-generational pedigreed westies that don't have, for example, skin issues anywhere in the line?
Are you a member of any Westie clubs?
Reputably bred westies sell for up to $1,500. However, anyone willing to pay that much is going to hang up as soon as they ask you those questions and you say no. Your BYB westies will probably sell for $400-$600... Maybe $800 MAX. Responsible breeders are lucky to break even on a litter based on all the other costs. Responsible breeders produce more than enough pet quality Westies, so don't say you're just trying to make quality dogs.
Registration means nothing. It doesn't mean they're a good example of the breed, it doesn't mean they're healthy, it doesn't mean they're free of genetic defect, it doesn't mean they're show quality, it doesn't mean they have good temperament. It just means they're able to be shown.