Why leave the US? Because government policy is destroying commerce. Taxes are destroying wealth. The Patriot Act has suspended our most important traditional rights.
Where might be better than the US? All of the English speaking countries in the New World (except Canada) are worth considering if they have preserved a legal system based on Common Law. Among the Spanish speaking Latin American countries, in order of preference are Paraguay, Peru, Columbia, Panama, Costa Rica, and there are other good possibilities that might require some thought, Uruguay. It is too bad that the Spanish speaking countries don't have a legal system based on the English Common Law.
Why Paraguay? Off the top of my head:
It is one of the cheapest countries in the world.
Land is cheap
Government is relatively small.
According to www.heritage.org, on a scale of 0 to 100, where 100 is most free Paraguay gets the first score and the US is the second score:
Government Size 90.4 72
Fiscal Freedom 96.6 67.5
Trade Freedom 83.2 86.8
Monetary Freedom74.0 74.0
Property Rights 30.0 44.0
It looks to me like Paraguay is a better choice than the US if one values freedom. And it's cheaper.