You can consider the Motorokr S9. It is a bluetooth headphone and supports A2dp, so you can listen to sterio music thru it (have to install hack on N810 to enable A2DP), and can also use as a headset.

As a headset, the only disconcerting thing is that the voice only plays in mono thru the left earpiece. Initially that seems starnge while you are wearing it over both ears, but over time you get used to it.

If you are on the move, and don't want to wear it on always, the good thing is that I just loop it around my neck and it stays under the collar, so I don't look too geeky with this earpiece around my neck. Even in usage times, its not too visible when I put it on around my head / neck.

The sound is good, and the listener can hear me very clearly (sonsidering there is no extended mic at all). I paired it to my N810 as well as to the Samsung Blackjack and pairing is a no-brainer (pair code 0000).

Over all good heaset/headphone.

Would like to mention, as stereo headphone, sound is excellent on it.