What and How to feed my 2 months old puppy...?

I'll be receiving my puppy in a couple of days. He'll be shipped from another state. He's an Olde English Bulldogge/Dogue De Bourdeaux Mix(French Mastiff). The breeder is feeding him Eukanuba and Purina mixed. I've been doing my own research about some real high quality puppy food(dry) for large breeds. I came up with some Brand names like: Wellness, Solid Gold, Eagle Pack Holistic, Nutro Ultra Holistic, Blue Buffalo, Merrick, Innova, Canidae, Fromm, GO Natural, Orijen(excellent canadian dog food) etc. just to name a few. I'm thinking to feed him Eagle Pack with Orijen (mixing it). Maybe 50-50 or 60-40 (60% E. Pack, 40% Orijen). I need some suggestions from experience people please (breeders, dog nutricionists, dog owners, veterinarians, etc). I'll appreciate your help !