Unitarian Universalist congregations come in a number of varieties, and one of my favorite -- and amazingly little spoken-of -- are the "First Unitarian" and "All Souls Unitarians" in the middle of the United States, founded before 1930.
These churches tend to be (or were) more churchly in tone, but with a universalizing theism, or a humanism that might be mistaken for mysticism. The kind of place that made the "fiddle and lecture" form of worship -- a large, conspicuous sermon, solo musicians and a relatively little else -- work. The kind of place where you hear of the Oversoul and the Golden Rule in the same breath. This is the kind of place I would go half the time, in tandem with some liberal pastoral Quakers or liberal, low-church Lutherans. (Alas, I we don't have any of these around here. Except perhaps the Lutherans.)
This was (or is) a vital, intellectual and practical churchmanship with a kind of reforming and American aesthetic. I think we should do more of that.