All four are on Linda Arndt's good list, so which ones are readily available in your area?
Mine love the Innova EVO and are thriving on it. Shiva doesn't fart, and Bimmer has become an enthusiastic eater as opposed to a dog who ate because he didn't have a choice. Kharma, well, she's gorgeous and she loves it. I also don't feed as much of it as most other kibbles, and their stool volume is much less.