[timn1]

If you plan to spend more of your time at the National itself, you can stay at one of the nearby hotels in Rosemont (at "convention rates"). There's a Metra stop within easy walking distance of the conv. center which would take you into downtown without much trouble, or even to Wrigley if you transfer to a bus. That Metra also goes to O'Hare, which is very near the convention center. Or you can always drive into the city for the day if you have a car.

If you want to spend more of your time sightseeing, priceline or hotwire a room downtown and drive (or train) out to the convention. Parking in the Loop/Gold Coast has gotten REALLY expensive, however, whereas hotel parking in the burbs is pretty much free for guests, so bear that in mind.