I like the New Year's Eve show, too. Elvis was slimmer than since a long time and gave a really commited performance. Even the quality of the film is good enough to watch the whole show.
The Birmingham concert is not my cup of tea, because Elvis was obviously under the influence of uppers. Even though he performed some rare songs and did it well, I have an uneasy feeling listening to that very show. And the picture quality isn't too good either, at least from the 8mm film I know.