Just finished Showcase present: Batman and the outsiders. I think this is the oldest, not Vertigo DC book I've read and I've really liked it, it felt surprisingly modern sometimes, the only thing I disliked is the quality of the book itself, it was just crap (worse than the Marvel Essentials, I don't think I will buy any more showcase collections).
I would really like to read the rest of the series but I don't think there are other collections published from the first volume.