web search
Fred,
When I typed "ATP rating" into my web search engine, a very long list of websites were listed. I suggest visiting enough of these sites to make a short list of schools that may potentially meet your needs. The factors you may want to consider for selection would likely include school location, cost, guarantees and availability of suitable aircraft and instructors/examiners during your desired time-frame. Your needs may also include help with visa arrangements, TSA processing and determination that you meet all other rating eligibility requirements prior to travel. I suggest a methodical approach that includes contacting each school by telephone that makes your "short list" and asking any questions you may have. Their responses will tell you something about the character of the school. The large schools tend to be more accommodating to the foriegn visitor in that they seem more willing to and are often better equipped to provide all neccesary services that you may require. You can expect to pay less at a smaller school if you are prepared to handle more of the details yourself.
That said, I have heard favorable reviews from other pilots about their experiences at ATP inc. and at Sheble's. Just depends on your needs and what is important to you. Look them up on the web.
Bon chance with your search!
Best regards,
Westhawk