@confused2082 This site is a good resource for dog food info, and the 5 or 6 instances where I researched other sources to confirm their claims, they came through as legit, so the info seems pretty reliable.
I haven't done research on the Wellness brands that aren't grain-free, so I can't comment on those, but I've been feeding my dog Wellness Core for the last year. He had been on Science Diet (blech) at the shelter, then I put him on Blue Buffalo for about 9 mod, but he just spit out those tiny "LifeSource Bits" all over my apartment and I was tired of cleaning them up so I switched to the Core. Additionally, he had been eating grass nearly every time I took him outside, so I wondered if he was having digestive upset. Vet said it probably wasn't a major issue, but I could try some grain-free if I wanted to.
He is doing really well on the grain-free Core. It isn't cheap, but he eats less volume and poops far less than he did on the Science Diet that the shelter gave me when I took him home, and less of each on the Core as opposed to the Blue Buffalo, too. He's the ideal weight for his frame at 40 lbs and has a pretty moderate-to-high activity level, he eats free-feed and averages just under 2 cups a day. The $60 bag lasts me about two months, which isn't too bad in my book. He doesn't eat grass any more and seems to be the picture of perfect health, normal, healthy poops, shiny coat, good energy…
I've heard rave reviews of Costco's grain-free dog food. My sister is part of a forum for people who have rescue hounds like hers, and everyone on there says the Costco brand is fantastic and much less expensive than other grain-free, so that is another option. Do your own research, though, because without a Costco membership, I haven't so much as even seen an ingredients list, so you'll have to check that out first.