Hi L.,
Check out the online Birthday Party Guide on www.kidwinks.com. It lists 400+ birthday party venues throughout the Chicago area, and many have reviews from other parents. If you become a member of kidwinks, which is free, you can then sort the list by distance from your house so you can easily find what's nearest you.
Here's the direct link to the Guide: http://www.kidwinks.com/ForKids/6/KidsBirthdayPartyPlaces...
Kidwinks is also a great source for finding things to do with your kids. The Events Calendar is full of fun happenings, including the free days at area museums, the Kids Eat Free Calendar lets you click on a day to find where kids eat for free (or cheaply, or where they can be entertained by a magician, etc. during the meal), and you can click through the Ongoing Activities Section to find things like children's museums, nature centers, bowling alleys, etc. etc.
Good luck finding your birthday party place!
J.