I recently got myself an early Christmas present ....
My vote goes with the new Logitech F540 Wireless.
I've tried Bluetooth earpieces (picks up game audio and causes echo and delay)
I've tried Turtle Beach (P21 I think) and found it uncomfortable to wear for hours on end. Also, I was always getting tangled in the cord.
Researched wireless sets and found that Turtle Beach only makes one for the XBox and PC. Logitech makes a popular one for a decent price but it was only made for PC. Then they added the F540. It's a bit pricey at $150, but it's worth every penny in my book. The large leather ear cups are very comfortable and don't make my ears sweat like the Turtle Beach did and most importantly, it works as one would expect. The transmitter has 3 separate inputs (one being a standard 3.5mm headphone jack) so I use it to watch TV at night when my wife is sleeping. All my online friends (GT5) comment on how clear my voice sounds, while they can hardly hear most of the other people in the room.