The usual suspects
As always the Brits seem to stop as soon as they get to the coast and there is a lot of ground between the coasts in the USA.
Both Florida and Califonia are the usual suspects for europeans learning to fly and both are considered by most Americans to have a higher cost of living than most states. Add to this an intimate knowlage of European flying costs and you have some of the more aggressive operators in a perfect position to Nickel & Dime people out of a lot of money with unforeseen charges and restrictive practices.
My recommendation would be to find a place to fly that is away from the holiday destinations and that usually only expect Americans to walk through the door, the prices will be lower and you are likely to get a better standard of service, I did my FAA CPL/IR at Ann Arbour, just west of Detroit. It was all a long time ago so recommendations of individual businesses would be of little value but the general principle still stands that you should keep clear of the usual suspects.