Excellent list, and pretty much precisely what I would have posted with a few very minor tweaks: Ruby and Python are nearly interchangeable. Time is limited, so have a look at both and pick which one you like. Tcl is also a neat language in some ways - it's even better for DSL's than Ruby is, and has the lisp like property that you can create your own control structures.

Anyway, jaggederest's list is pretty much the list to learn if you want a broad overview.