Lin, I know how frustrating and confusing it might be for you to hear so many opinions. But, when it comes down to it, you've just got to use your common sense! Over the past year, I've seen many posts about your concerns about Grace's health problems. And, despite all vet visits and your care for her, the health problems continue. Something's gotta change, girl!

Please, no Purina. No Iams. No Kd. Nothing you can buy at a grocery store.
I know when I started researching foods (when I wanted to switch from Canidae), it was kinda overwhelming. It was nice to know what others were feeding, and then I did my own research from there. I decided to go with California Natural, as it is a good quality food and was rather economical (I buy it at Pet Supplies Plus and there's a buyer's reward program). Just take the plunge and start somewhere!
Good luck, and I hope Grace feels better soon.