Naperville is on the top 10 list of public schools and I'm told they have a fantastic gifted program. As far as private schools, Montessori is often noted as being a great school for children whether gifted or not though it only goes through the 8th grade. If you peruse the internet for gifted programs or schools in the Chicago area you will find various options.

I wish you the best of luck! I understand how you feel...we all want the best resources for our children!