While I think Scala has much potential, I've been thinking the past few days that perhaps I might be happier with F#. There are some features that are unique to each, for example, I don't believe that F# has anything like Scala's implicit arguments yet. However, I'm still having a little trouble wrapping my head around the best way to structure some things in Scala. Additionally, writing Scala code somehow feels rather verbose, much like programming in Java. I'd probably be able to do both things better with some practice (converge on a design and write more concise code). Whereas with F# I feel much more confident that I could just sit down and get code written. And I think I'd be happier getting code done rather than using a slightly whizzier language.
So I've installed F# and will probably start doing a little hacking once I'm satisfied with my presentations.