You could also use the Asus Xtion Pro Live. Like the Kinect, it's derived from the original PrimeSense device. As an added bonus, there is no annoying extra power cord and the RGB and depth frames are actually synchronized.
The problem zero userbase - it was supposed to be launched with an ASUS media-center PC with some other cool tech as the WAVI Xtion (WAVI is an existing product they make that does uncompressed 1080p streaming). Unfortunately, that just didn't happen, so there's still no competing consumer product.