Thanks to maruudn for starting this poll! We've contacted the vendor on your behalf and they've made the Sennheiser G4ME ZERO Gaming Headset available.
I've actually come to this conclusion myself, and have since I started this poll landed on a pair of Phillips Fidelio x1/00. I plan on pairing it with a modmic :-)
Although I must say, the Audio Technicas in this poll are excellent. I was actually planning to get a pair of ATH-ADG1's until I discovered the x1's are on a 50% off sale in a local store near me!
An open-back design is always best for gaming. This is because an open-back design allows for air to run though the cups, making sure your ears won't sweat for long gaming sessions. More importantly, an open-back design provides a much more open and large soundstage than closed-back design, which is important to hear all the details, plus it gives better positional audio. A closed-back design is better for one scenario only; if you're gaming with friends at a LAN party etc.