Everyone else already noted how great the original series was... Let's focus on something else: These UK Nettwork DVDs!
First, I'm in the USA, and want to report that YES, these discs DO work in the USA! They really are Region 0 (there are lots of conflicting reports) which means they'll load and play in any region-locked DVD player anywhere in the world.
Next - they are PAL, though, not NTSC, so you must have a DVD player and TV that can display them. Most current DVD players can handle this fine, with some converting the output to NTSC and others simply passing the PAL to the TV. Many modern TVs will handle a PAL signal, but not all.
Finally, although they are "digitally remastered", the video quality isn't great. I have a feeling the source film (yes, this was shot on film) has degraded somewhat, and this is the best you can get. The audio is amazing, however, except for the one commentary track that was recorded to the surround channels instead of the main ones...