Naples is pretty good but you will pay more than the cheapest. They sort out visa's which the others schools don't. I never had problems getting into US but apparently the immigration officals are within the rights to refuse entry without the visa that Naples can arrange.
Brittiania is also good but there planes are old and tired.
Also a bit of warning about posters on schools from the US. The market has shrunk and most of them are feeling the bite so you may find that some satisfied customers are actually the schools themselves.
Search Wannabies for a particular school before paying any money out. Quite often the cheapest school with the biggest advert isn't the best.
MJ