I don't want to live anywhere that "needs improvement". Unfortunately, no nation can meet that requirement - so I would have to limit my choices to where needs the least improvement. Also, they would have to speak English, as I'm too lazy to learn a new language at this point of my life. It also needs a moderate climate.
Quito, Ecuador. Quito is beautiful, the cost of living is very low, the temperature is moderate, health care is affordable, the people are very friendly, the monetary system is the US dollar and the government is one of the most stable. From what I could tell when I was there a few years ago, it needs very little improvement.