250 point event, what would you field?

A while ago my FLGS ran an event that was designed around speed gaming, i.e. lots of little games over the course of a day. The rules of the event limit each player to 250 points, a minimum of 3 models, and no summoning, the allies matrix is in effect, but obviously lists are generally going to be unbound. Games are played on 4x4 tables with good terrain. I won the last event with a Beast unit and two CWE Hornets, the list that came second was a riptide and four pathfinders, but I was wondering, what would people here bring given those conditions? The only list I had real difficulty against was a guy running three obliterators.

The event's running again and I don't want to bring the same list, I'd be interested in suggestions. I'm not limited to DE, I also have Eldar, Harlequins, Tau & Daemons.