Wisconsin.
The in-state rivalry will always be there. We need to continue to make hay with the Illini, regardless of their sad state, to own the conversation in Illinois.
But if we have an aspirational peer for NU, it should be Wisconsin. Barnett circled Iowa in red on the calendar, but I think Wisconsin is a better aspirational peer today. They are a very good school with an excellent football program. They recruit similar players, and develop them very well, sending many players from different positions to the League (think about all the WI linebackers, DLs, RBs, OL, and WRs in the League). Wisconsin players stay out of trouble.
I like Chryst. Seems like a very genuine guy who represents the program well. Most other B1G coaches have a fairly high buffoon quotient. Chryst does not. Just keeps quiet and has good teams.
Wisconsin has a great fan base. They travel well, fill Camp Randall, and are gracious guests. They respect Fitz and NU. They are like Nebraska fans without the whining.