Firstly, what is your career? Certainly Spanish will cover most of latin America and Brazil's close portugeuse. Of course, you may meet up with a rainforest indian or, in my case a family of Mixtecs picking california spinach who knew less spanish than english! Chinese and japanese are pushed for business in the far east. Inversely, lots of chinese and japanese are learning english. It really hinges on your career. If your a Mozart loving musician definetly german.