Gandalf - Welcome to the Windy City!! I'm sure that SweetWillie will be able to reign in with at least as good a suggestion as mine!, but for: Real Chicago, downtown, and not too expensive......
My call is for the Berghoff.....many, many years of serving real, old time Chicago German food....
Hope that's of help, but whatever you choose, do enjoy your stay in our fine city!
Best wishes.....