Best is hard to say. The earlier it is, the noisier it is, due to improvements in both the TK-41 and videotape. Some transfers to DVD, such as the early Bell Telephone Hour, have had very strong noise reduction applied, resulting in a misrepresentation of the noise and video smear of the camera/tape. And of course, very noisy material does not code well in MPEG, which has its own effect on the texture of the noise.
As to color itself, disregarding other aspects of quality, some of the best I have seen is the fragment of tape remaining from the RCA exhibit at the New York World's Fair, though of course it's only on Youtube, not on a DVD.
http://www.videokarma.org/showthread...world%27s+fair
The color on commercial DVD's is always suspect because you don't know how much "correction" was applied when the transfer was made.