For other upscale hotel dining options, Seasons (at the Four Seasons) and the new restaurant at the brand, spankin' new Park Hyatt (don't recall the name off-hand) are certainly safe bets for a fantastic meal at expense account-type budgets.

Everest is truly exceptional and Trio (just to the north in Evanston, IL) offers an interesting and tasty dining experience.

You literally can't go wrong with any of the restaurants already mentioned.