Most impressive youtube demo clips

If you are implying that you can judge the sound quality of a system by listening to a  YouTube clip, that is just plain scary for you and terrible advice for anybody else. Audio quality on YouTube is low resolution. Limitations of the mic & technique used in the recording will make great systems apparently suck. 
Streamed video is certainly a fine tool to learn about features of gear and to see what others pair it with, but beyond building a list of stuff to check out in person, please don't draw any serious conclusions about the sound quality of the components from YouTube or other video. Cheers,
Spencer 

sbank  +1

@sbank , +++++++

A lot can be learned from these demos: 1. Does it sound like music? 2. Is music distortion free? 3. Is there a lot of detail? You can't fake any of these parameters. You can also get a better "feel" with headphones (if used). These demos are a lot better than nothing.

Sorry, but you can't judge a system by a YouTube video.