Great question-- I've been asking it myself recently after spending several months thoroughly enjoying Haskell, although my background is very different (organic chemistry).
Like you, C and its ilk are out of the question.
I've been oscillating between Python and Ruby as the two practical workhorse scripting languages today (mules?) that both have some functional components to them to keep me happy. Without starting any Rubyist/Pythonist debates here, but my personal pragmatic answer to this question is:
Learn the one (Python or Ruby) that you first get an excuse to apply.
