Great to hear Northwestern is already on the radar and that you will be in Evanston to a take a look at the Wildcats as a Citrus Bowl prospect. While in town though you might want to take a look at our opponent as well once you have completed your primary task since we will have to play someone else is the Citrus Bowl and I have heard they might be almost as good as us.
To answer your question, another hotel to consider is the Marriott property in Northbrook located at 933 Skokie Blvd. Last time I stayed there for a Northwestern game there was a large contingent of Purple Clad fans booked there including some of the players' families. It has the advantage of having a Ruth's Chris Stake House on the premises as well. The big advantage though is its convenience to the expressway with a fairly straight shot to the exit closest to Ryan Field. (I believe Old Orchard is the exit that then connects onto Lake and then to Central but check your Google Maps, GPS, or whatever to confirm.)
Here is a link to the hotel:
http://www.marriott.com/hotels/hotel-photos/chinb-renaissance-chicago-north-shore-hotel/