Best Programming Language

C++/Java/asp.net/Visual basic/Delphi.. etc So many programming language, but what is the best to learn. Please, do not answer by choosing the easiest to learn. I want the one which the most wanted in the industry.

I am a computer teacher for 4-7 grade students. I want to start teaching them the basics, and different rules, and ways of scripting, for the java programming language even though I’m not a master at it either.