Thank you so much, everyone! He/we have done some research on the colleges you all have suggested, and based on your feedback his top picks right now are:
DePaul
Western Washington U
U of Tulsa
ASU - Barrett
Santa Clara
Chapman
Loyola Marymount (LA)
Also:
Clarkson (but probably too far from WA to be worth it, going to be 11+ hours to get there)
Willamette (but CS seems too small there)
He also really likes U Rochester as a reach, if his SAT scores don’t improve. To me, U Rochester seems like a great match for him-- their CS program looks good, their economics program looks good, and he can also more easily participate in music, drama, intramurals than he would at a big public school. It is smaller, yet big enough to offer a diverse array of courses and also has a more diverse student body. I sure wish it were closer to WA.
He would really like to get away from the TX heat, so didn’t like the TX suggestions.
His list is quite varied-- publics, privates, large, medium, small-- schools with very different student bodies and social atmospheres, so it will be interesting to see what happens next.