The best video is still a camcorder using video tape.
Digital cameras treat video as an after-thought.
They add it to the camera because it is inexpensive to do.
So far, only one digital camera has been designed to be a combination camera (still photos and video).
The Canon TX1.
But it will cost you closer to $500.
Here is a link to the specifications:
Click the green link right under the photo of the camera to read the review of the TX1.
I am looking for a portable/slim digital camera with the best video quality, preferably under $400.