My colleagues and I went through more or less this exercise in 2005 and ended up with Python/Django. I know everybody tends to become a crusader for their development stack, but I think this was a fantastic decision, either by luck or judgement.

To be honest I still don't see any compelling reason to switch to anything else in 2014, but if I was looking I'd be strongly favouring Go as the language, as it seems like the preeminent forward-looking, popular-ish, well-supported language. Rust and Erlang would also get a look in.