Well, that $840 is due to importing and tax costs. Like I said I still think that a US bundle is on the way, but personally I'd want one that would include the Kinect as well, and the recent batch of bundles have been excluding the Kinect. Maybe I'll just wait for a $399 discounted Kinect version (they pop up from time to time) and then pay for the game. Or perhaps eventually Gamestop will have a good trade in deal, although I don't see myself trading in my Xbox 360. I'd rather just trade all my non-music/dance games, since I have literally HUNDREDS of Rock Band songs, not to mention a lot of XBLA and other full games on my HDD.
Come to think of it, I better not use that voice functionality too much. Part of my bargaining power with my kids is that I'm the only one in the house who can pull up Netflix and Amazon on the TV. If my kids figure out that they can just say what they want and the Xbox will deliver it to them on the apps, my level of control could be greatly compromised.