Evanston can be killer commute to Northbrook depending on the time of day you are travelling. 5AM-10AM is peak in the morning and 3PM-7PM is peak in the evening. At rush hour I would expect a commute of around 45-60 minutes. 94 has a lot of traffic. I have been in gridlock traffic on 94 at 2AM.
Evanston is a good place if you want a little bit of the city and a little bit of the suburbs.
Apartments right now in Evanston are generally easy to find. Most apartments are older and do not have any available parking. On street parking in Evanston is a major problem. You need permits and that doesn't guarantee you a spot. In areas along the lake in Evanston garage parking can cost you upwards of $800/month. Most people in Evanston use either the Metra or CTA and commute to the Loop.
The Northern Suburbs are generally quiet and family oriented. I think I might look into the Glen in Glenview. It has some nice shops, some big box stores, and a movie theatre. It still is mostly family oriented, but It would allow you to be in Northbrook in under 10 minutes. There is a nice apartment complex in the "Town Center" part of the Glen. The Glen would allow you to either use the Metra to get to Downtown Chicago or your a short drive to Downtown or Evanston.
You also might want to consult a realtor if you have trouble locating an apartment, but I don't think it should be an issue. Make sure you have good credit, because landlords on the North Shore tend to pay a lot of attention to that.
Links:
The Glen Town Center ~ Glen Town Center Mall, Dining, Shopping and more at The Glens
The Glen Home Page