You guys have been great giving info and advice.What in your opinion would an American gain by living in Paris France half of the year(culturally,economically,dating,realestate investment ect ect), that could be superior to what I'd experience living in Manchester or London?
The following are merely my opinions:
The American would gain culturally by being exposed to one of the most intelligent, elegant and stylish cultures in the world. In many respects French people make the English (and Americans) look like clumsy tongue tied idiots.
Economically, the euro has shown itself to be a particularly resilient currency during the recent economic crisis.
Dating: French girls are wonderful! However, they were not put on the earth for the delectation of visiting expatriates, and if you go over there with that attitude, you won't get very far. The fact that you actually asked this question makes your whole post seem decidedly trollish.
Real estate values: The official average price (Q2 2008) was € 6,580 per square metre for unoccupied old apartments in the City of Paris. It increased by 10.1% in comparison with the same period 2007.
France is definitely more laid back than England, and more interesting in every way. A big problem might be if you don't speak the (very beautiful and precise) language and/or can't be bothered to learn.