The biggest disappointment to me on the 700P is that I can't find a BT headset that gives both excellent sound quality and stays connected. How do the same headsets perform with the 700W vs. 700P? Does anyone have such experience to comment? Because if the BT experience is better on the w than p, I would consider switching over to the 700wx when Sprint releases it. In other words, is the poor BT performance due to the hardware or software (OS)?