I was hoping I could get some advice on which Bluetooth headset to buy. Looking around I have narrowed it down to three - Jawbone Era, Plantronics Voyager Pro HD, and the Jabra Supreme. Right now Plantronics Voyager Pro HD is probably top of the list as its considerably cheaper. What are people's experience with these headsets and what do you recommend? I will mainly be using it while driving, so noise cancellation will be the most important feature. Also I am using an iPhone 4S, so compatibility with Siri is imperative. If you guys know any better headsets that you recommend would be welcome to ideas.