Orijin is absolutely outrageous in price here as well, but it is an awesome food! Any time you cut out the grains in a dogs diet it is beneficial. Dogs, and humans for that matter are not intended to eat grains like corn. They are used as fillers and are high in sugar. Its like giving your kid pez or pixie sticks when you feed them high grain content. When you look at your ingredient list the first few ingredients should be meat, not corn or other fillers.
Orijin, Taste of the Wild, Evo, Blue Buffalo, Natural Balance or Wellness foods are all great foods. All are grain free with simple ingredient lists and many have varieties with novel proteins for dogs that have allergy and/or digestive issues.