I'm just putting this info out there for future reference.
As of 2016, Wheaton Warrenville (south side) arguably has the best academics of the three you mentioned. One way to quickly gauge a school's academics is to look at how they fared in state competitions. For ICTM, unless you're going private, you want your school to be in Division 4AA, and you want them to not have zeros on any of the subjects.
In 2015, Wheaton Warrenville South scored points in almost every category and placed 23rd in State, while the other schools in the areas you mentioned got pretty much zeros across the board. To be fair, though, none of the schools did very well.
Now people in the area will always have excuses, like "oh our smartest kids don't participate" and what not, but really... ask anyone in the state and no one will argue that the top schools on the list (Stevenson, Naperville schools, IMSA, New Trier, Evanston, and, recently, both Glenbrook schools) aren't better.
So if you have kids in AP tracks like someone asked about in the comments, keep these points in mind. This is for high school only by the way. But if your kid's about to go to middle school, you should look into a good school district because they start doing placement tests early in those areas. They won't admit it, but it's easier to get placed on advanced tracks as a student there rather than as a transfer.