What you would like to do with your language skills would be helpful.
Program silly web games for fun and what have you? Java or Flash (whatever that uses).
Write general use programs or traditional non-web games? C family of languages are a good set to do that.
Artificial intelligence and other university level research? Lisp.
The real issue is is that you won't bother learning any of these languages after you spend three minutes and see the amount of work involved.