I have nothing to add...besides, should probably start to watch Seinfeld...
Yes, you should. Seinfeld is the undisputed number one sitcom in TV history. Here are my top five:
1. Seinfeld
2. I Love Lucy
3. All in the Family
4. Sanford + Son
5. The Honeymooners
Sanford and Son is up there not because of the quality of the show, but because how groundbreaking it was for black television.
Your choices are pretty good, but I would have to add Curb Your Enthusiasm, which is the funniest show on now, somewhere.