I suggest making it a headpiece, no dangly bits, cept maybe for the remote. It would be very unobtrusive that way, unless you require the use of your ears and the surrounding area.
Similar to that thing but with Apple flair. There is more than enough room to incorporate the new HD and longer lasting batteries I think. In fact, you could put them in opposing positions to provide balance. As done here it appears. The Japanese are rather good at design, not something you hear often though.

Similar to that thing but with Apple flair. There is more than enough room to incorporate the new HD and longer lasting batteries I think. In fact, you could put them in opposing positions to provide balance. As done here it appears. The Japanese are rather good at design, not something you hear often though.