Comment by peterfoldi

You have Lisp knowledge, so maybe Haskell is not the best candidate for "a new way you think". Given your background I would say you probably would enjoy Scala more than Java (targeting the same JVM). I am not sure if one can learn enough from Smalltalk to justify the effort it takes to learn an in-practice useless language. If you don't speak JavaScript yet, that's a good candidate, especially if you use your FP experience in it and not just go the OO way most people do.