The Hotel Blackhawk in Davenport, Iowa (one of the quad cities) is a really great hotel if you find yourself in that area. I also enjoyed my stays at the Hotel ICON in Houston.
Union Station in Nashville was something else though - highly recommended if you want to visit BNA. Cash prices were kind of crazy, I did stayed their on points. (vs. the blackhawk, which is a beautiful hotel but is only a Cat 5 and rates are generally under $200 a night, can get as low as $150 with specialty rates, maybe more).