I would say first off, look for a food with no by-products and the first three ingredients being meat or meat meal. I mean, beef, chicken, turkey, duck, vennison, etc. I also look for one's that aren't too grain heavy and have fruits and veggies in them.
At petsmart, disregarding all their really crappy foods like Friskies, Whiskas, Fancy Feast and Iams, Authority is a step up, then you can look into Nutro Naturals, I prefer Chicken Soup for the Cat Lovers Soul, Wellness, Premium edge, Solid Gold... not all are available at PetSmart though. Pet Supplies Plus is great too, or Petco.