If you've seen my robotics sessions and were interested in doing it yourself, Trossen Robotics (the guys that were/are handling Phidgets in the US) are having a sale - looks like you can get a really good deal on a MindStorms NXT kit, plus a bunch of other "humanoid" robots. 

And if you decided to go the NXT route, check down on their main page a bit.  It seems they now handle Mindsensors - a 3rd party collection of sensors and controllers compatible with the NXT.  Some of them look pretty interesting and they seem quite reasonable compared to other add on's I've seen.