This is such a hard question, and is asked so often! Everybody's budget is different, evreybody has a different number of cats, and different preferences. So I can't tell you one way or another. You'll just have to figure out what is best for you.
Zoe gets unlimited dry kibble (she's only 11 weeks, she eats about 1/3 cup a day) and gets 1/4 of a 5.5 oz can in the morning, same in the evening. I feed her everything, because I want to give her a variety and don't want her to get picky. I know the following brands aren't the best for her, so she isn't at her health-maximum, but what I feed her is about equal in health as to what the average American eats per day, perhaps even better.
But like I said, she gets a variety.
Nutro / Meow Mix / Friskies / Fancy Feast / IAMS
Pretty much whatever I can find in our tiny PetCo and Wal-Mart... Good luck!