If money and beef are no object, I am really loving the Acana Ranchlands. Right now we are 1/2 TOTW bison PUPPY version because we had a brand new bag and Acana Ranchlands. The dogs have the best coats ever, the firmest stool, and I am only feeding 1 cup to my 52 pound shep., 2/3 c to plump Melli, and 1/2 c to little Cubbers. The protein is a little bit higher than I prefer but they seem to be really thriving. I have been able to reduce my probiotics to 1x a day instead of 2x and the shepherd is not having any grumbly tummy (so far).
I am liking Acana, but the husband DID say money no object as long as there is no Chinese ingredients. Haven't looked into GO though.