These three moves are playing at the Grand and they are all very good.
However. Don't go to see Black Swan if you're not prepared to cover your eyes for a lot of it. It's bloody, and not a little scary. Good. But still a horror movie.
True Grit is a really good movie from the Coen Brothers. Not as good as their best, but a great Western with a really great cast. And The Kings Speech is a very good drama, again with a great cast.
Spend a day and see all of them! (Or a half day and just see two, if blood and ballet is not your thing.)