you DO NOT need a visa to train in USA!
Having just read the thread on visas for the US i can say that most of it is wrong. Right now myself and two guys doing hour building and CPL are sitting here in sunny Florida. On the way over two of us where stopped by immigration, in Dublin and UK and after explaining truthfully what we where doing both got through. Not only that but the immigration man told me that quite a few people have come through the airport recently on visa waviers on the way to the US for JAR training.
Also, if people want to check the FAA FAR/AIM they would see that JAR instructors are allowed to sign people off for solo's and cross-countries