Taste of the Wild. It has got to be one of the best foods out there. It's totally grain-free, and has several different sources of animal protein. They LOVE this food, they have the softest fur, and they look so healthy! This is the way I think it should be, it doesn't seems natural for cats to live off of corn and by-products.
Fed Science diet for years then switched them (6 of them) over to TOTW. Then one of them developed chronic kidney failure and I had to switch back to a "kidney health" food from science diet because the TOTW has too much protein for her. That is something to be aware of if any of your cats have any kidney issues.