Purdue and Indiana are both winners as far as being very low on the rude/threatening fans scales. There are a few BIG schools where that's not true.
Also, tickets will be relatively cheap and NU will win
Indiana is loaded with babes if you're looking for that and have suitable skills. Lovely campus. Bar scene is close to the stadium. Purdue is dudes, engineers. They won't bombard you with idiotic arguments and are low on the drunken maniac scale. Nice pretty new Indi airport is 1 hour to IU 1:15 to PU. Personally I'd be more than willing to drive to PU from Chicago Midway if a cheap one leg flight seems appealing.