I am looking for fine dining in the Chicago area, am going to be in Chicago in two weeks with my family and am searching for nice dinners. Have heard a lot about Blackbird, David Burke's Primehouse, Avec, Spring. I have been to Chicago before and ate at restaurants which were fabulous, Hugo's Frog Bar, Wildfire, etc., and now I am wanting to try the higher end restaurants. Do you have any suggestions where to go eat other than those mentioned, or your opinions on the ones mentioned? Thanks for you help it is greatly appreciated.