<p>How about Drake? Not sure if it's already been mentioned...</p>
<p>The University of Chicago is smallish (4,000 undergrads). It has excellent Math and Science offerings.</p>
<p>Chicago is actually closing in on 5,000 (4,936 at end of last term with 1,314 in this year's freshman class). Following the trend of lots of other smallish universities planning growth in undergrad numbers. Not so small any longer.</p>