FannyCornforth- Thanks so much for your suggestion! UW's program looks intriguing, I've put it on my list of programs to explore further.
qwer7890 and napoleon87- You both make valid points. I guess my main worry is I don't want to be an "island" in the department. I have already experienced that with my BA, and to some extent with my MA, and it's not something I'd like to go through again. While I've been able to successfully work within the system to make my work relevant to the work of those around me, I think I'm at the point where I'd like to be in a department where at least a couple classes would be offered that are more directly related to what I do. I feel like I've done the work to acquaint myself with the some of the literature surrounding material culture, but I've never been "formally" trained in it. Perhaps I'm placing too much emphasis on this, and maybe I've let some prior frustrating experiences sway what I think is imperative for me in a program.
And napoleon87- Incidentally, I am an Americanist! The program at BU does look like it could be good for me, and I've been curious about how American Studies would fit with what I do. I have a question though about American Studies versus Art History- if I think I would eventually like to work in a big name art museum, how would the American Studies degree be perceived (especially since my MA is also in another field)? Will it hinder me to not have a more rigorous Art History background? Or is an interdisciplinary background not as much of an issue as I'm afraid it will be?
Thanks so much for all your input everyone! It's nice to get some perspective on my predicament.