Not a bad list, but I'm surprised so many from seasons eight and nine made the cut. Some favorites of mine that were missing:
It's hard to say which ones I might replace, but I don't think The Little Kicks or The Gum would make my top 20.
How about the soup nazi? One of my all time favorites.
I don’t recall the names of all the episodes. Only that I watched them all several times - and laughed out loud each time. Comedy is difficult to do well, Seinfeld brought it to a new level.
The greatest series ever.