I know you don't want the "box" on the side of your helmet or the phone/intercom features, but I wanted to let you know Sena just released a new headset/intercom model SMH5. It comes with a boom mic but you don't have to use it, you can leave that part off the helmet if you want. It'll connect via bluetooth to your gps, music player, phone etc and works like a charm, I really like it a lot.
It's quite nice compared to fumbling with wires running to your phone, etc. which I have done for years.
Priced right too, little over a hundred bucks.
Oh yeah, and the "box" is quite compact compared to their flagship model (about 1/3 the size) so it's not that bad.