first off, if you want to fly in the USA you really need to think more about VISA rather than flying as a first port of call. You may realise that it's no easy task to just get into the USA, however in the short term there is the J-1 Visa scheme but I'm no expert. This will allow you to stay and study there , leading perhaps to some restricted work as a instructor or something similiar upon which you might be able to extend it.
Also you don't need to spend all that money and grief training at OAT in order to fly in the states. For the pirce OAT charges you can train in the states and get a type rating on the NASA Space Shuttle
If you want quality schools why not try Flight Safety (now there's a flight institution). They are a heck of alot cheaper and if you decide or cann ot get to stay in the states then at least you have something that you can return to the UK/Europe with and convert it.