Welcome to FT Goldie84

Well, are you looking for an airline program? If so there are several opportunities for one of those.

You just have to explain to use what your travel patterns are:

-How often per year are you flying to Europe?
-What class of service are you flying (First, Business or Economy)?
-Do you pay for the flights out of your own pocket?
-Where in Europe do you fly most?
-What do you want to redeem your miles for? (Upgrades? Flights in Economy, Business or First)?
-What is your home airport in the US?

All these are things that you have to consider when choosing a program. Also it might be worth to select an American FFP based on the alliance that this program is in (Star Alliance, One World, SkyTeam) that way you can use both the miles that you collect on domestic and intercontinental flights for awards, maybe even earn miles while in the US with an FF CC
Those are the kind of things that all weigh into the decision