For a robot — and even for a human — the MechRC has some seriously impressive moves. It can perform pretty much any motion you can program, including head-stands and backward tumbles, and it really maintains its balance well despite the complex maneuvers. That, and it has a set of speakers built into its chest to blast whatever you want it to dance to.
If you're worried you won't be able to learn how to use the MechRC right off the bat, the 'bot comes with 100 movements pre-programmed, as well as a 3D interface for programming so you can see what you're doing.
You get the MechRC and everything it takes to run it for $600.