Seinfeld has been one of my favorite TV shows since I was about 9, and now Bleach, How I Met Your Mother, Merlin, and Chuck have made it in my favorites list as well. All 5 of the shows I mentioned are hilarious (Bleach's funny moments are usually pretty weird though), Chuck has action, and Merlin has fantasy. If I had to list them in order of how I like them, I would go:
5. Chuck
4. Seinfeld
3. How I Met Your Mother
2. Bleach
1. Merlin