I happen to be partial to the Intercontinental O'Hare (5300 N.River Road Rosemont,IL 847 544 5300). More upscale than most but rates are usually competitive given the state of the O'Hare hotel submarket. Food choices include Mccormick & Schmicks and Capitol Grille both adjacent to the rather chic gallery/lobby. The airport shuttle service runs 24/7.