I don't see it offered on their website yet, but SuperFLy
http://www.superflyrc.com/ has promised us a MicroFly. It's around 5 ounces, has the prop in a prop slot in the middle, is very slow and fast and in-between, and very manueverable, and it looks very promising for indoor full-contact combat! It won't be "cheap" but it's extremely durable.
Jim