We currently feed the cheaper Wal-Mart brand. The dogs (4yo Pitbull, 8yo GSD, and two 2.5yo labradoodleXretriver) do fairly well on it. There haven't been any evident health issues for them.
When we just had the Pit and GSD we fed Canidae. It was great but really expensive and with four 50lb+ dogs, my dad decided we had to switch to a less expensive brand. Luckily my dogs were fine with the cheaper brand. That being said, when I relocate to Nor.Cal for graduate school, I plan on taking the Pit and switching her back to Canidae.