I am fortunate in that I can live anywhere in the world an American citizen may live, so I have chosen...
HAWAII
as the best place on earth to live.
Great scenery, healthcare, you're still in America, tropical island beaches year-round.
Seeing all the beautiful asian tourist girls from Japan every day is always nice. I should know, I married one (and have been with her almost 6 years now!
www.kencalhoun.com/wife.jpg ).
And virtually no violent crime, we have I think the lowest homicide and violent crime rate in the USA (though property crime is high).
It's not perfect paradise, but it's dang close.
Oceanfront hawaii kai executive condo, a/c and 1600 sft ocean panoramic view with a high corner unit, tough lifestyle, but somebody's gotta do it - yeah baby!
Taxes are high, and getting up at 2am to trade is tough (market opens 3:30am local time), but other than that, it's great . I am done by 6am (I only trade the open) and that leaves me the whole day for golf and shopping with the family each day.
It'll be Eight years this month, I've been in Oahu (Hawaii Kai) and I wouldn't live anywhere else on earth.
Though trips to thailand, hong kong and japan are on the to-do list.
http://www.hawaii.com/
ken
PS I should try some of the other places you have all mentioned, they sound great too. I also liked Colorado Springs, Colorado as my favorite mainland place to live, back in the early 90s. I could get a 2200 sft large house for 98k there, no way to get that here. And great mountains, back country, pike's peak, manitou springs, excellent place to live.
(re below) my wife's born in Kobe, Japan, raised there, though Korean by background.