I don’t see why you would rank UW over some of the Canadian schools, especially considering the enormous cost difference. Your student can benefit just as much by going to any of the CAN schools listed, with the possible exception of McMaster.
CalTech is a reach for anyone, as is Stanford, but in your case they(and the Canadian schools) make more sense than Washington or Berkeley.
UBC and Toronto are very good for CS, and Waterloo is about as good as it gets. I haven’t kept up with McMaster (used to live in Hamilton), so I only know of them as being strong in Health Sciences. Funny story, a neighbour who is a dual, was accepted by Yale, and rejected by McMaster. 
FYI, I am a dual citizen living in the US. S2 wants to do CompE, and is applying to Waterloo. WA, was considered(we used to live in Seattle), and rejected, for a variety of reasons.
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