I agree with the guys above! There are 2 big factors you have to consider!
1) Location
2) Working Language
I live in the Brussels area and just about everyone speaks French but I can't speak a word of Frence! However, I work in an Int. Company where the working language is English. Everyone I know is a Dutch speaker, so I've been learning dutch in order to speak with them in their native language.
So, if you know what kind of job you are aiming for and where it is located (Brussles
middle/ Flanderin
North/ Waloonia
South)..this can really help solve your problem with choosing!
BTW I stuedied Japanese too..learning a different language is going to be REALLY easy for you now!