since I didn't actually answer the thread question, lol...
I feed either Pedigree or Purina. Whichever happens to be cheapest at the time. (I'm a bad person.)
My favorite dogfood by far, for nutrition and value, is Tractor Supply's brand, Diamond Naturals. It has brewer's rice, so isn't grain free, but is corn free. And that makes me feel a whole lot better. Plus, I can always see the difference in our dogs. Their coats are healthier, they're healthier, everything's better.