[FurrBall]

I would learn Common Lisp. It's not strongly tied to a paradigm like Haskell. For the same reason I'd stay away from Clojure. I think forcing a particular view or paradigm makes a language less "exotic".

CL molds itself to the paradigm and problem domain with no bias. It allows ultimate macro power even over other Lisp dialects.

There are efficient compilers. It's not tied to the JVM so you can deploy native, but there is a JVM alternative if you want it.