The corn products in Iams made my cat very ill. She did much better 'off' it.
I can highly recommend CAlifornia Natural. It has very few ingredients, they do not include corn or wheat products, and the food is very palatable. Chicken and Rice made my cat's fur soft as mink.
I have just given her a bit of the new Herring and Sweet Potato mix and she loved that too.
It's also moderately priced. Always remember too that a higher quality food will be cheaper than the 'cheap' stuff since the cat will eat less (there is less filler and more nutrition in the good stuff)