$400 would be too much, unless we're talking about an ultra deluxe bundle. For standard bundles I'm going for $300 or even $350, less seems unlikely given all the tech that's behind it. Moreover, you have to consider the extra expense from games. Judging from the trailer launch lineup is going to be pretty strong (Zelda, Super Mario, Skyrim, Mario Kart, Splatoon) so consider an extra $100-$120 for at least two games.
Arachnofunk's comments