I'm very very interested in this topic as well. Basically, any bluetooth headset will do. Differences are:
+ Noise cancellation (more than 1 mic)
+ Sound quality
+ A2DP (ability to play music, chat on Skype)
+ portability
+ battery capacity
+ design (you wouldn't want a Jabra Sport for business usage)
+ price (this turns me off)
Beware of imitation to ALL models, especially Nokia brands. Imitation have inferior sound quality.