Excluding Hong Kong and Taiwan as well and assuming I will live comfortably... I would try Japan, Sweden, Norway or Germany.
This is a difficult question for me. I would actually like a country with a warmer climate but with a similar social system. Most countries that I find interesting are not countries I would want to live in for a longer period. (Madagascar, Thailand or Indonesia all sound great to live there for a year or so). Especially since I have young children I want a western country with a good healthcare system. If I had to move out of my country I would probably just accept the colder weather and move to one of the Scandinavian countries (or maybe Canada or Germany).
I haven't been to any of these countries, so I don't know what the hell I'm talking about, but: 1) Spain 2) Australia 3) Switzerland 4) Belgium 5) Peru 6) Tahiti 7) Fiji 8) New Zealand 9) Argentina 10) Chile