Normally I would not throw out ideas I wasn't very sure of. In the past I have recommended places I have not been, but only on the advice of trusted friends.
But because there seems to be little advice about so much of Iowa, I'm going to post a link to an article in the Sunday paper titled "100 things to eat in Iowa before you die". The article is bylined to only one person. I'm sure it is not the result of extensive research. The link I provide will take you to feedback on the article, although it can link you to the actual article.
Some post seem to be by people that should be on Chowhound, if they only knew about us. They have actually peaked my interest in several towns.
The large amount of post about "chicken Lips" in Burlington make me question the honesty, but hey, who knows.
Anyway, for what it's worth(I hope it works).