I was at my inlaws a month ago and noticed that they had a new coffee table book called "Strategic Relocation" by Joel Skousen. I paged through it for 20 minutes or so and I thought it was a pretty thorough analysis of the US. He covered topics I never would have thought to consider and I'll probably be going through it in detail in the near future.
Here's a link to Joel's website
Strategic Relocation
Good luck with your search!