I'm pretty sure there will come some P12's within the next 2 months. They just released X12, to replace the X11, and I've read they are gonna make P12's too.
No matter what it's a quite good choice for low cost. If you have the money you can always buy the DSS Sound amplifier. It actually makes a big difference.
I had the DX11 (the X11 with DSS) and was quite happy. But then i wanted to go further as I started playing tournaments and such on the Xbox and i bought the PX5's. And they aren't comparable to the X11/P11, but those are fine for a low budget.
Turtle beaches are only good for gaming though. They are pretty bad compared to PC headsets when listening to music or watching movies. Not too good at deep sounds and quite bad mics, but still some of the best console headsets.