The CPU/GPU will be dirt cheap. Even at the high end of the potential specs they won't cost more than $30 each. 4GB of laptop DDR3 ram is $20-ok that isn't the world's best ram but it's about 4 times more than will be in the Wii U. That's $80. The controller cost is hard to judge but I don't see it been over $100- the iPad screen was judged to have cost less than $100 18 months ago and the Wii U will have a far smaller one and isn't as high quality. That's leaves $70 everything else which is easily achievable.
You're telling me you haven't seen what the Wii U is capable of yet?