All things go. My favorite Sufjan Stevens song at present is "Chicago," but in some ways I like this a capella version better than Stevens's own. But I have a taste for a capella in its own right, so that's perhaps the reason why. But I also like his acoustic version better than both.
And he takes and he takes and he takes. There's an interesting discussion of his "Casimir Pulaski Day" at Majikthise.
He will apparently be in Austin in September, so I'll have to see what my plans are as that draws near.