If you want to get a little crazy Mongolian Buffet is really, really good and is pretty cheap. (8.50 with a drink when I went last saturday) It has the most selection of any buffet I've ever been to in Iowa, has a sushi bar, and you can make your own dishes with all the raw ingredients, choose your sauce and they cook it in front of you.
Chinese Homestyle next to the old Taco Bell is good, Cocost is good, and Golden Wok & Panda are okay like youd expect from a chain. I've heard Mandarin is good, but I've never been there.
Avoid King Buffet, I don't like the food and the next day is always rough even though my stomach is pretty resilient when it comes to food like that. Avoid it.