SteadiDrone QU4D Quad
The SteadiDrone multicopter kits are a available in kit or RTF form. The QU4D is a strong and robust quad capable of carrying a GoPro 3. The RC Tiger Motor MT3506 motors are powerful and extremely quiet motors.
It is important to have a well balanced quad for optimal flight performance. The QU4D has been tested in wide mode without the GoPro and it balances well around the center of gravity. Tests pending with GoPro 3 Black in wide and standard mode.
Here are some details about the board such as arm angles, center of thrust and center of gravity for the QU4D in wide mode (not standard). Note that the exact value will vary slightly based on how you built your quad and perhaps even the version of the frame you have.