When last I checked the hotel Nikko had by far the most spectacular selection and stellar preparation, although it is a bit pricey. If you can get over to what I believe is Washington and Morgan, Wishbone has a fantasatic brunch that, while not as southern as they would have us believe, is quite delectable(try the shrimp and grits). Barring those two choices, the Art Institute does brunch quite well, with a decent selection of reasonably priced wines and champagne to accompany. Sorry I can't offer more choices, but I've only been here a few months. Enjoy and happy eating.
Chicago, IL