That would be awesome, for that price I would sell my MacBook and anything else unneeded. That would be awesome but it would instantly melt through my glass desk or possibly burn my man hood sitting in my lap.
I have a 15" and have always thought that 12" would be too small, my wife has one about 3 years old and I don't like working on it. However having checked out the latest MacBooks I realized that with the higher screen resolution, it's actually not that bad.
I think ReanimationLP is right - it would be nuclear reactor. Not only it would have too much power but you'd need at least 4 cooling towers, so it wouldn't melt through EVERYTHING.