If I didn’t have to worry about making a living, I think Italy would be infinitely fascinating, besides being a place where I’d love to be immersed long enough to learn the language – but I doubt there’s much of a job market for Shakespeare professors who arrive with no Italian whatsoever.
If I did have to worry about making a living, probably the UK.
Two years and I couldn’t travel outside of the country?
Well, not Bulgaria. I already did that and I would have gone crazy if I hadn’t left the country at all. I’m going to say Turkey. I think I could easily live in Istanbul for two years without ever running out of things to do or see, and if I wanted to get out of the city every now and again, I’d hop on a bus to Cappadocia or Antalya or whatever.
Since I really, really, really, want to leave, this one is easy: anywhere where I can get a job 
Or: Canada, Sweden, Norway, UK… and then retire to St. Lucia.
I live in the US, and would choose either Canada or Australia, as I have friends in both countries and their cultures are similar enough that I wouldn’t be completely lost.
Canada and Australia have the benefit of being english speaking. Canada is too far north and likely to be chilly.
Probably Mexico. Maybe Cancun, somplace on the gulf.
I live in the US, and have said many times that if I were to win the lottery, I’d move to Ireland in a heartbeat – so there ya go.
I’d definitely go to the UK. Plenty of places to explore in 2 years.
Ontario, Canada. It’s right across the bridge, and if I have to stay in the new country for two years, I’m not going to be adventurous.
Australia! Canada would be a not so close second.
Canada. I’d have “landed immigrant” status. Nice place too.
There’s parts of Mexico I’d consider.
I’d like to try Australia and Iceland.
Western Canada or New Zealand. Maybe France (somewhere along the Loire or maybe Dijon).
Australia would be my number one probably up by Cairns some where. My number two would be a tie between South Korea and New Zealand. I lived in Korea for 7 years and loved it and I miss the food almost every day but it has the worst weather I’ve ever experienced. I’ve never been to New Zealand but from I’ve read it would be enjoyable.
I guess the United States would be my first choice. I’ve been there a number of times, and while there are differences between the US and Canada, I don’t find them to be so great that I couldn’t adjust easily and live there comfortably. Plus, the US is big enough that I could use the two years exploring the parts I haven’t been to yet (assuming I don’t have to make a living; and even if I did, I could still take vacations in those parts).
Second choice would be Australia, followed by the UK.
I’ve given this sort of question a lot of thought over the years. I require political and economic freedom, elbow room and a reasonably cool climate. A strong economy and low taxes are a plus. Low cost of living is nice, but generally incompatible with a strong economy. A population that speaks English would be convenient, but my French and Spanish are maybe just good enough that I wouldn’t feel totally isolated as I begin to improve. My top 10 choices would be
Vegas, baby, Vegas! 
New Zealand
Engwand, second Ireland.
Canada - particularly Montreal - is amazing, but it’s just too damn cold.
If money were no issue then England, definitely. I don’t think I’d have any problem keeping occupied for 2 years. (Would trips to N. Ireland, Wales and Scotland count as ‘leaving the country’? Or Ireland for that matter?)
If I had to go somewhere cheaper, probably Costa Rica.
Wales. I have family there and love the place. Mind, I’m in England so that might be cheating as its also the UK. If so, then I’d go for Canada.
I agree with you on everything but Macau being a selling point, what a dump.