Lets see you work in adult so mainly gonna get paid in USD. 1 USD = about what 0.80 euro now? I think even for a bit it got down to 1 : 0.70. So you loose 20%-30% or so of your income in conversion if you move anywhere that has euro for currency. FL is a fairly cheap US state to live in. Its one of the 7 that has no state tax so all you get boned for is federal tax.
Like others said you just can't move to another country and call it home. If you do go to another country and live on a visa you still have to pay US taxes so no advantage. Unless you are willing to renounce your citizenship, which i suggest you don't do.
Take a long hard look at your life before you make that step. I am not saying don't go for it but no matter where you live thier will always be something wrong no matter what.