http://oyate.org/ is an amazing site with explanations and references for what is good and not so good. Also, you can call them, they are extremely helpful and will talk to you and tell you about books not on their list (because the haven't been vetted by their committee yet)
Code Talkers by Joseph Bruchac deals with issues of being essential to a military unit while feeling completely isolated. It deals with the issue of language and culture. It is geared for kids, but the movie that was made from it is geared for parents.
Caleb's Crossing by Geraldine Brooks is written mostly from a white girl's perspective by a white women, but it is the story of the first Wampanoag to attend Harvard University and takes place on the Vineyard. It's a better option than most books (if you aren't going with a Native author). A lot rests on the teacher to be able to explain why the white people and Wampanoag act they way they do (society, rules, cultures, laws, etc.) and bridge that abstract gap.
I love Charles Mann's book, 1491: New Revelations of the Americas Before Columbus for a nonfiction historical take. The adult version is my current FAVORITE book on Native American history.