I feed Orijen and have done so for years. I would purchase the exact same food that the breeder has your pup on. Puppy formulas are easier to digest and have a higher nutrition content.
We only have a few months to give our new pups every chance at a long and healthy adult life and the best way to ensure proper and complete nutrition is to feed them food which is formulated for their age groups.
Congrats on your new "baby"!!!