Best grocery store brand dry cat food?

my cats approaching the one year mark and over the course of this year he started eating wet till it could no longer sustain his appetite, so i started to mix in dry food, but then he started to reject the wet food and i havent been able to get him to eat wet food since. Ive been feeding him Iams Kitten formula since its the only KItten dry cat food i could find at my grocery store, but now hes almost an adult and im wondering what may be a healthier option of dry food for him? I dont have a car and any vet office brands are out of the questions, theyre just too far out of the way for me, my options are any brand sold in london drugs, local grocery store (Thriftys is closest but i can bus it out a bit farther to like save on and stuff) um, also a zellers is close, and if i go really out of my way theres a Wal-mart and a Petsmart. What is the healthiest possible option of dry commercial cat food?? since the store ive listed im pretty sure dont sell speciality brands. I'm looking for health, high protein low fat and corn fillers. i know they suck commercial brands but whats the best of the worst of my options.