"C# is one of the best languages out there for generic enterprise work and app development" - i see you have great tools if cs is soooo good.
I also love Haskell, but let's be honest - it won't get me hired, or at least not here in Bulgaria.
C# is the "toy lang"? How old are you exactly?
As if the market demands and hirability is all that matters (and that said in a forum of hackers and entrepreneurs! Lots of which have actually businesses run on Haskell, Clojure, LISP and other "toy" languages)...