I'm sticking with $199 even though I know there is a possibility that it could be no more than $250.
It's hard to gauge since we don't fully know everything the 3DS offers as we don't know whats up with the stylus, the bottom screen, the port on back, the internals and online connections.
But I still think $199 is Nintendo limit on mass market pricing regardless if I'm willing to pay $250 for something more capable than what they'll likely release.