I always use Nutrena 18% All Flock, I then mix it with sunflower seed, grit, oyster shell, Calf Manna, and kitten feed. ( Make sure it isn't a ton of the mix, It's not good for the chickens) I use Purina crumbles for my OEGBs and the mix. I stopped using organic feed, the chickens wouldn't eat it. It was very dusty also, and it cost about $30.00 per 50lbs bag.
Purina Start and Grow and Purina Layena, Nutrena, and Albers. I feed Purina but I think they're all good.