New Puppy, What is the best food for him?

I feed my 7 lb miniature pinscher Nutro Natural Choice. They have different sizes and flavors and whatnot... but as a small breed puppy, they make "Small Bites Puppy". Its about $11 for a bag, but its worth it! Purina, and other brands like it, have fillers (like corn for instance). It is of no nutritional value for the dog, except to fill him up faster and make his poos bigger and smellier, and in turn, hes hungry sooner and eats more (so you buy more...). Fritz (my minpin), has teeny poos and they don't really even smell. I know its gross, but to me that makes spending a little extra on natural food worth it. Plus, they have a small bites adult formula too that I recently switched to, and he had no hesitation in digging in and chowing down! The only downfall is that its not sold at WalMart. I've only been able to find it at PetSmart Have fun with your new pup!!