Everybody who's posted is absolutely correct.
If you look in the health/diet forum, there are a TON of options. Also, dogfoodanalysis.com lists many of the wonderful foods! 4-6 star foods are best. Anything lower is really not good. The main thing to look at is the first few ingredients in the list.
Innova, Canidae, Wellness, are all commonly used by YTers with good ratings
Just wanted to add one more thing, you won't be able to find quality foods at Petco or Petsmart, Wal-mart, etc...you'll need to find a pet boutique or distributor. Luckily, most of these companies have a "store locator" option online so you can find a store near you!