One of the things I'm trying to take into consideration is what I think I can adjust to on a longterm basis compared to what I'm willing to adjust to on a shorter time frame.

What I've learned by staying a couple of places for several months is that a lot of things don't start bothering me until I've been there for a while. The hassling of street vendors is on my list of things I don't want to live with on a daily basis, thus eliminating many parts of Asia and Central America.

Thank you for the suggestion, though. The more places I consider, the better defined my ideas become.