Taxes for Expats are based in New York - but their clients hail from all over the world. They focus solely on US taxes for Americans abroad. They've been doing this for over 20 years - with a record of excellence that few firms can match.
They offer the same level of service online that you would receive by visiting their office - without having to leave your house. And if you move, they will be able to continue working with you no matter where in the world you end up.