I'm down for a Horde night. I've ran 1-50 once on normal so doing it on casual should be a little smoother. I'm thinking Sandbar and hunkering down in the top tower.
*EDIT* Talked to Rob, he's down for insane campaign tonight. I should be on around 8:30 PM. We should do it as arcade, that way we get respawns. Achievements still work.