I love Kensington School of Naperville. I drove 25 minutes each way just for my boys to attend school there. They offer a Transitional Kindergarten class for my 5 year old that did not make the Sept. 1st cutoff because of his late birthday. Few programs offer this. It is not cheap, yet not super expensive like The Compass School. It was too expensive for us, but I have heard good things about it. At Kensington, the teachers are certified (4 year degree in early childhood education) and they use up to date resources including Jolly Phonics, Animal Island, Math their Way, and Handwriting without Tears. The teachers we have had have all been absolutely wonderful!!! The kids attend weekly spanish and music classes with teachers specializing in those areas. The facility is lovely, kept very clean, and is secure. My sons were more than ready for kindergarten after attending. I am a third grade teacher in the public school system and I believe Kensington is a great school that really prepared my boys! There is a guide to preschools that used to be published by PACES (a moms group) for the whole area. PACES is not doing it anymore but I heard another group has taken it over. Unfortunately, I don't know that group but maybe someone else on here will. Good luck!