I use the Telex 5x5 Pro with a custom molded earpiece. There is nothing on top of your head and nothing at all rapped around to the other ear. I literally forget it's there sometimes. I have used it in the 757 and DC10. I wouldn't have anything else.
The A320 series is very quiet and you don't need a full-covering headset like you do in a regional jet. This is exponentially more quiet than any of the regional jets.