I've been to every country on the list.
SWEDEN: Beautiful country, kind of similar to Canada. Hot women who love to bang. It takes a while to become friends with most people...they seem kind of aloof at first but its just the culture. Prices are absolutely insane.
NORWAY: Not all that different from Sweden, really. More of an independent spirit I guess...a lot of people are in touch with their Viking ancestry. Again, really expensive.
DENMARK: Meh. A real dump in a lot of places. Copenhagen, outside the tourist area, is a pretty nasty city that I'd never want to live in. Avoid.
AUSTRIA: Beautiful country. Hot women, free-flowing beer, amazing scenery. As someone said though, Mozart crazy. I'd put this one high on my list.
CZECH: Used to be the "hidden gem" of Eastern Europe, but the Czechs got wind of their popularity and prices have increased in accordance. Gorgeous country but the people weren't all that friendly. You didn't list it, but POLAND is much better IMO. You get the same amazing castles, hot women and so on at half the price.
THAILAND: Thailand is just outstanding. There's a reason so many drunken backpackers flock there. The people are cool, food is great and there is lots to see. Its also easy to visit Vietnam/Laos/Cambodia while you're there. The one downside is that prices have increased dramatically in the last 10 years, but its still pretty cheap.
HONG KONG: Cool little country. A huge metropolis put on a small island with lots of nature and such at arms reach. You'll get laid a lot if you go there.
SINGAPORE: Pretty nice place for a visit, but wouldn't want to live there. It has a bit of that "Demolition man" utopian vibe to it, although its easy to get out of the city if you want. Horrible country for drinking though...prices are through the roof and many bars close before midnight.
These are just my opinions. You have a lot of nice countries to choose from