Gary and Stan, another consideration, other than state income tax, is leaving from a country that doesn’t tax retirement income, etc. For that reason, I understand South Dakota may be a good option. Some expats are changing their domicile to SD for those reasons, and using this organization to help them do that: http://mydakotaaddress.com/SD%20Residency%20faq.htm
Understand, please, I can’t vouch for these folks or for the legality of all this….