If you just want a mono headset with a low profile and good sound, I like the
Motorola Elite Sliver. It's not the cheapest, but it works very well, has good sound and is hardly visible when wearing. I especially like the low profile and the mono for listening to podcasts while I'm out at the store or someplace around people where I don't really want both ears with buds in them.
If you want a stereo ear bud type headset for music, it's a little more difficult. I have tried the
Motorola S10-HD which had decent sound and worked well, but they were tight and the manual doesn't say anything about the side bands being bendable, although someone had posted they did (gently) do this effectively. I had already returned them so I didn't try it.
The number one BT headset on Amazon is the
LG Tone HBS-700 which I also own. They sound good, are extremely comfortable and would be perfect except for the fact that with my Droid Razr they default to a very soft, tinny sound which can only be remedied by pressing both volume buttons a few times to load a different EQ setting. I wouldn't mind that so much except that whenever I pause or stop the music, the music becomes soft & tinny again. As near as I can tell from both Amazon reviews and other forum threads, this is only a problem with the Droid Razr. I have used them with an iPod touch and there's no issue at all. So I've kept them just because I know of no other ear bud type that is as comfortable and they do sound good with the changed EQ.
I will be interested in what others experience is with this.