Paragliding helmets are another good place to look. They are designed to be snag-free and fairly aerodynamic. They have pockets for in-air communication systems [audible would probably fit] and they actually have solid protection. They aren't DOT approved, but they'll still help. The Charly Insider is one of the more significantly padded helmets.
In reply to:
Does anybody actually jump any of the charly (or similar) helmets? They look great