To correct an earlier post in this thread,
UC est. annual COA: $58,776; UW est. annual COA: $48,708.
UW awards a merit scholarship (“Purple and Gold Scholarship”) to OOS U.S. students. You would be automatically considered for the scholarship, and with your stats, a likely recipient. “For autumn 2015, scholarship amounts range from $3,000 to $7,500 per year ($12,000 to $30,000 over four years) and were awarded to about one half of U.S. students who are not residents of Washington State.”
Your stats are high enough to indicate that even if you were not a direct admit to the CS program at Washington, you would have an excellent chance at admission to the major after completing the prerequisites. Here are some articles that may be of interest to you:
http://www.quora.com/What-is-it-like-to-be-a-computer-science-major-at-the-University-of-Washington
http://qz.com/343521/18-universities-produce-half-of-us-and-canadas-computer-science-professors/
http://www.computersciencedegreehub.com/50-innovative-computer-science-departments/
It is hard to beat UM as an instate student, but if you apply to Washington, I recommend also applying to the Honors Program:
http://depts.washington.edu/uwhonors/apply/freshman/faq/
Good luck!