I'm currently using a Sennheiser MMX 100 Bluetooth headset. I particularly use it for listening to audiobooks and music. It is perfectly fine when you are indoors and can control any ambient noise, however, I do like to walk and that is where the current headset fails dismally. My walking entails walking along a busy lane, and the headset just cannot cope. Can anyone please advise me on which noise cancelling headset, could best cope with the circumstances described and roughly what it is likely to cost me.