I recommend the Turks and Caicos Islands. English is the national language (though many people also speak creole), the currency is USD, there are no income taxes and you can get residency with a real estate investment of as little as $75k. It's also one of the most beautiful places to live in the world. Cost of living is comparable to the midwest (they do have 15% sales tax), and the internet is fast. Great place to do a tech startup.