1a. Seinfeld - Simply one of the best, if not the best show on TV.
1b. The Munsters - Still watch it on DVD and TV.
2. Buffy the Vampire Slayer - Never missed it, the wife and I would cancel all functions to watch this.
3. X-Files - Originally our reason for staying home on Fridays and the one reason we watched FOX at the time.
4. The Sopranos - The only reason I had HBO
5. Dr. Who - Thanks to Tennant I feel in love with the show again and the wife is now a fan.
Honorable Mention...
King if the Hill - I never realized how funny this show was until Adult swim replayed them. I love this show.
Futurama - See King of the Hill.
Andy Griffith - Barney never lets me down.
Life on Mars - Both the UK and USA versions
Closely catching up if they continue to be good...
Being Human - Love the drama and the story lines.
Robot Chicken - So many skits, they keep me laughing. Real World Metropolis, Law and Order (chicken Style) and last nights Dark Cristal. Just to name a few.
Torchwood-
Warning: Spoiler! (Click to show)
I love the way the keep killing off regular cast member. It keeps me guessing