what headsets work with iCall VoIP? on a mac

I have a Mac and will be adding a soft phone from Vonage. A VoIP line. I would like to use a head set and mic to make my phone calls. Which head set is my best bet for clear 2 way conversations without echos?
I will probably do Skype calls as well.

SoundBlaster World of Warcraft Headset

SoundBlaster World of Warcraft Headset

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