Why FAA CPL ?
For the simple reason that it makes it easier to build time in US, especially if one should be interested in obtaining a CFI,CFII and MEI ratings.
Once you have all the JAA licences it is fairly simple to get FAA certification on basis of your exsisting qualifications.
Time building opportinities in Europe are somewhat limited compared to the available positions in USA. Also more and more schools are able to provide Visas for a person with right qualifications.
a330 Ever flown in US ???? from your ansewer I would have to say that you have not.
JJ