Hi. I actually received my MA in Art History from the University of Oregon. Like the post below, I can confirm that the Northwest is a great spot of the country in which to live. The MA program at UO is actually quite good (the PhD program, not at all) at sending students to more prestigious universities elsewhere for PhDs, and they do offer a museum studies focus to the program for those interested. However, it is not particularly strong in American Art, but the faculty certainly work with students outside their respective disciplines, especially MA students.
All reports I have had from University of Washington confirm that this also a very good school for the MA and average to slightly above average school as far as PhDs are concerned.
Hope this helps.