So you want to build your own robot? The ROBOTIS Darwin-Mini DIY Robot Kit has everything you need to get started. It comes with 16 Dynamixel XL-320 servos and customizable 3D printable frames. You can control it from your Android device. The robot comes with an open-source board and rechargeable battery.
The robot can be programmed with R+ Task and R+ Motion software. You can expand it with additional sensors. More information is available here.