Ive had good results with Lynx as well but quite expensive time you've got all the bits and pieces that go with them.
I used Harry Mendelssohn's own make ( pilot clones ) in the Hatz with leather helmets.( Also from him) .The helmets seem to pull the headsets on better than just sitting on your head and deffo quieter.Much cheaper that DC's and still using them (years later..sans helmet) in the RV.
Ive always had excellent service from Harry over the years...wouldn't go anywhere else.When you phone for advice its always available if you are spending £5 or £500. Better than talking to some pimply scroat that doesn't know an intercom from an MP3 player!