Hi,
I have been looking into training in the U.S. for the last few months. There is one thing I have found that is very important. You must be on the proper visa. You can get the full details from the U.S. Embassy at 0207 499 9000.
There was a post over the weekend that really sums up the training situation in the U.S. I highly recommend that you read it as the starting point for your research into training:
GoneWest's Comments on Flight Training in the U.S.A.
TTF