I have worked with a very large number of computer science graduates from U.Mass Amherst and many, many of them are excellent. U.Mass is very good for CS. High tech is of course a major industry in Massachusetts.
I noticed that you thought they would pay for Waterloo, which is also very good for computer science. The Maclean’s university rankings for CS currently has UBC, Toronto, and Waterloo tied as the top three in Canada for CS, with McGill fourth. Any of these schools would be excellent for a degree in CS, and all are well known by employers in the US. Maclean’s is by the way a Canadian magazine that probably has the best known rankings for universities in Canada. Admissions in Canada tends to be significantly more stats based compared to the US, and your stats are excellent. This would help your chances at any of these four very good universities.
Rental property and small business ownership both tend to have very unfortunate implications on need based financial aid in the USA.