The grading system isn't always the best way to choose a food. It does help if you're unfamilliar with food though. Just looking through the thread can give you ideas on foods. There's lots of other food threads here as well, just do a search.
Wysong is an amazing company, I highly recomend this food. It is a bit pricey, not only because of it's quality but because of it's packaging. Although it depends on where you are, it's a lot cheaper in the U.S.
Here's their pet protucts:
Wysong
You should ask the breeder you talked to if they recomend puppy food, and if they do, until what age. Everbody's opions are different on this. Once you're pup is on a adult food, depending on your other dogs needs, they may all be able to go on the same food. There are a ton of great foods out there, look around and see what's in your area, then start to compare. :wink: