From an IT perspective, I would want to learn Mandarin, Japanese, Korean, German, Afrikaans, French, Arabic, Russian, and Spanish, in that order or priority.

From a more economical perspective, I would learn Japanese, Arabic, Mandarin, German, Spanish, Korean, Russian, and French, in that order of priority.

From a world traveler perspective, I would learn Spanish, French, Italian, German, Japanese, Mandarin, and Arabic, in that order of priority.