Which is the best food for doberman puppy?

I have 8 week old dobe puppy,vet from the store recommended nutrena loyall but when we bought it i went online and it says that it has a lots of corn so its not supposed to be good for him,i also herd that diamond naturals is good for doberman,i want to use the best food there is i don't ever want to have problem with his health anyone knows what is the best food (i dont care about cost) let me know

I've had great success with Taste Of The Wild High Prairie formula. No grain, soy or corn.