<p>I was going to say that if you are visiting Northwestern you really ought to visit the U of C also, but after this description, perhaps not. 
(I’ve found that there seem to be two kind of people: Northwestern people and U of C people, and I am firmly in the latter camp. <em>Everyone</em> thought my S was born to go to the U of C, but he chose D instead, much to the surprise of many.) Has your D considered Princeton or Penn?</p>