I'm heading to Chicago soon, it's my first trip and I'm looking to narrow down areas to stay in. I know I'll do one day near  O'Hare, one day downtown... I know other people mentioned Oak Brook, is there anywhere else I'm missing?

Thank you for your reply!  
I'll look into that area now.

Oak Brook is the place and Schaumburg is just as nice.  Check your messages

Thank you for replying!!

For a new visitor NM ave has a lot to offer in sightseeing restaurants and shopping.  
Take some time to see the lakefront.  

Arlington Heights is a good location as well....

We're spending two days in Oak Brook and a day downtown... is Magnificent Mile North considered downtown? lol And, what is the difference between Magnificent Mile North - Water Tower area and Magnificent Mile Area - River North area.

I'm going to look into this area as well, thank you!

Worth. It. You can get some pretty good last minute deals also.
Michael