I agree that honesty is the best policy, and if there's a breeder that has a problem with you being on more than one waiting list, and wanting to ensure you get the pup for yourself, then you may not want to be buying from them anyway.
Most breeders do require a deposit to hold a pup, but not to be on a waiting list.
Most breeders do require a deposit to hold a pup, but not to be on a waiting list.