My background is almost all C, C++, and some python. I have been fooling around with Haskell for a few months now. I can honestly say I haven't used anything on the list beyond the first two. Haskell falls very close to python in readability if you want it to. You can "go deep" and produce stuff that only an experienced, hard core functional programmer can understand as this guy does, but I tend to use it as a statically typed, fast python.

Flip through the first few chapters of Real World Haskell online and see that it is fairly readable.