"Socialism or Barbarism"
And I don't think there's very much wrong with "Workers of the World Unite!" For one thing, very few people in the U.S. actually know that this is an old commie slogan.
"Another world is possible" doesn't seem dorky to me. For one thing, since the thugs have been saying that another world is NOT possible (for the last twenty years), even though it's "vague," I look at it as the thin end of the wedge.
Joanna