Lozza
be cautious about the placement rates the U.S. schools advertise. The quotas are mostly referring to U.S. graduates only (i.e. they are not accounting for international graduates). Some schools will try to utilize their international connections, in order to get you an OPS job, but I wouldn't count on it. Also, I rather doubt that you'll be granted a Green Card based on your dispatch certificate (if you have some side qualification, it's a different story). Basically, it comes down to the fact that you haven't any sort of 121 dispatch experience, yet. I have seen U.S. carriers looking for 121 freshies for USD 18000 p.a. (per annum!). So, if you are not extremly lucky, I'd rather try to negotiate something with your current employer or somewhere else in Europe.
Cheers
fcit