Congratulations on choosing a dog for your family, hope it brings you many years of joy!
To try and clear up a few bits ...
There is really no such thing as a 'KC Registered Breeder'. There are Assured Breeders, and there are KC registered puppies. In both those categories, there are good and bad! It is a minefield, unfortunately.
There are many KC registered litters that are excellent, with attention to health scores, temperament and breed type. There are many with attention to little but producing puppies to make money, and as a puppy buyer it can be difficult to tell the difference.
My advice is always to find a breeder, and then wait for a puppy (obviously not for years, but find someone you are comfortable with who has plans for litters in a reasonable timeframe).
A good breeder should grill you as much as you grill them. They should want to know your experience with dogs (even if this is your first, and you can just demonstrate that you have researched and planned properly). They should want to meet ALL your family. They will want to see how your children behave around dogs, to ensure that their puppy will be safe.
I know it doesn't always meet with approval on here, but for me I would find someone who shows dogs (to demonstrate that they have a serious interest in the breed) and who does the health tests appropriate for your breed.
We had paid a KC Breeder a deposit for a pup, but we were waiting a long time on a pregnancy that never happened.
As an aside, NO decent breeder would ever take a deposit on a puppy that wasn't on the ground and of an age where it could be considered viable, and many are loathe to take deposits even then. If you come across a breeder who wants a deposit for an unborn puppy, or a puppy less than at least 4 weeks old, or who will take a deposit without meeting you - personally I would run a mile.