I used a pair of Turtle Beach Ear Force Z6As for a while and loved 'em... right up until I went through two pairs due to breaking them. Apparently my big head was doing battle with a section of plastic in a certain area and won... twice.
I've since ordered a Logitech G930 and am giving it a go. So far, it seems like a nice headset... though I do miss one or two aspects from the Z6As. I liked the individual channel control on the Z6A since it allowed me to easily manage the volume of TeamSpeak and my controlling frequency. I think the G930 has more sound isolation qualities because I found myself needing to seriously ramp up the sidetone volume in order for it to "feel" right when I started talking.