Consider a high caliber state school that is highly ranked in your son's field of study and has a good honors program. These schools offer generous merit $$$ for top applicants. Save the money for grad school or retirement.
Some schools to consider are Georgia Tech, University of Michigan (Ann Arbor), Cal Berkeley and the University of Wisconsin.
Note: Very few schools superscore ACT - so just pick one test score and report it on Parchment and on college applications.