Here is another robot arm kit for those of you serious about building and programming robots. The InterbotiX WidowXL Robot Arm comes with ROBOTIS Dynamixel MX-106, MX-64, MX-28, and AX-12 servos. It has an open source gripper with interchangeable fingers.
The kit consists of an ArbotiX robocontroller, power supply, programming cable, and everything you need to get started. Gripper CAD files are available, so you can design you own grippers.