What is the best Blue Tooth 1 piece headset for iPhone?

I'm looking to buy a Blue Tooth headset to use with the iPhone 4S. I want a 1 ear piece only and I want to have the ability to listen to music or the radio through Tunein Radio. If it can also activate Siri that will be an added advantage but not necessary.

Jawbone ERA Bluetooth Headset

this will help you

http://store.apple.com/.../H4603LL/A