I would recommand the NUC line.  The NUCs are made with quality parts and include thunderbolt and on case microphones.  The hole type microphones themselves are high quality and even prevent feedback loops when using an external speaker with a conference calls or Skype calls!  I would recommand i5 or above if doing any processing task becouse the i3 can only effectively do basic video playback, simple web browsing, and file viewing.