It's kind of surprising to hear a developer ask someone else's opinion about what language s/he ought to use for a project.
I mean -- you know these languages, right? You know your own skills? You know what you want do do? And it still isn't obvious to you?
I don't claim that there's any objectively obvious choice; just that you of all people ought to know exactly what language you can achieve your objective in. There's some combination of things you want to do, some list of attributes you want your final game to have? And that doesn't inform your language choice?
For example, if you want other people to contribute much, you'll probably avoid really complex languages that not very many people can code in. If you want to make a game that plays in a straight console mode, you'll pick a language that has bindings to the ncurses library. If you want to make a game that allows you to write plugins and just add them to your code so that work seamlessly without you having to touch any of the existing code, you'll use a language that allows you to define a plugin interface. If you want to make an Android game, you'll probably write in Java. If you want to make a Unix game, you'll need to play nice with system calls defined in C, which means either writing in C/C++ or picking a language with a good FFI or a good set of bindings for all the system stuff you need. If you want to train yourself to have better Lisp-fu, you'll probably use Lisp.
And so on. I mean, seriously... you want to do the project, but you don't already know what language you want to write it in? How's that even possible?
