Definitely The Simpsons - flyderman, I have a lot of episodes on VHS, though, taped when I was in the US. But not enough, and having them on DVD would rock.
Hill Street Blues
Sapphire and Steel - komikero, you rule for recalling that show!
Action
The Twilight Zone (the 1980s updated versions, not the 1960s Rod Serling originals which are already available.
Moonlighting
Connections - I wonder if anyone else remembers this extremely well-written "alternative view of change" by James Burke. PTV-4 used to air it in the 80's. Later on, updated versions played on The Discovery Channel, but nothing equalled the first run. I even have Burke's book. This science show puts the late Carl Sagan's Cosmos to shame.