Thanks for the thoughtful reply!

I found a page that seems to sum up the advantages of AAC rather nicely, and it's not by a maker of the stuff:

http://www.sungardenhouses.com/tech-aac.html

Besides the states you listed, they had suppliers listed in Arizona, Texas, Georgia, and Rhode Island. None of those are states I live in, but at least it's in a few more than before. In the end, I imagine I'll simply bring all of my ideas to a local architect, tell him what I'd like to accomplish, and see what he can do for me. I think it would be cool to have a house unique to this area, as long as it makes sense.