This author doesn't seem to know his subject very well, though. To say that an object-oriented, message-based, fully-reflective programming language goes "far beyond" Smalltalk suggests ignorance of how far Smalltalk goes.
So which (if any) of all these languages will you use to do a real project?
As a matter of fact, I work as a technical writer, so I'm not going to use any of these for any big project. However, I do code in my spare time and prepare small programs to automate tasks at work, when my boss lets me.
At the moment (literally) I'd like to try learning Haskell again, but it feels very difficult.
You're likely to just get people recommending their favorite.
If I were you I'd apply some combination of two criteria: which is the most fun, and what do I want to try to build?
It's great that you've done some broad experimentation (much more than I have). I suggest that you'll get a different and rewarding view if you try to use one of these languages to do something real that you care about.