I suggest looking at either the Sennheiser VMX 100 or Platronics 510 because it has the over the ear design and noise reduction technology. I currently own the Sennheiser and it's really been good to me so far and majority owners of the Sennheiser VMX 100 have also showed a liking to it. For the Sennheiser VMX 100, there's no earbud that goes in your ear which makes it alot comfortable then the other bluetooth out there. If not that then the Platronics 510 looks really promising from it's user reviews....But if you were choosing from your three, I'd get the Jabra JX-10 Series II. I've had the Jabra JX-10 and was very satisfied with it, especially with the ear gel and how durable it's been, but that didn't have noise reduction as the series II.
I'm looking for a new bluetooth. It will be working with a Sanyo Katana II. I tried the Jawbone because it was top-rated. While the sound was really good, it never felt secure on my ear. It always felt as though it was ready to fall off. I tried all the ear loops and ear gels provided. It was bad enough that I returned it.
So, here's what I'm looking at: Samsung WEP-500, Motorola H12, Blueant Z9 and Jabra JX-10 Series II. I would prefer a headset that fits firmly in the ear and requires no ear loop. Needless to say, I'm looking for good sound quality. I like the size of the first 3, but I've heard the Jabra accepts the ear gels from the old wired headset and those fit me great. I'm just concerned how far from my ear it would extend with those attached.