Anyone have any suggestions for a new anime to watch?

I’m looking to fill the void that Nurarihyon no Mago has left. And I’m waiting for Naruto filler to end. 

Anime I’ve already watched:

1. InuYasha
2. .hack
3. Ceres
4. Fushigi Yuugi
5. Ouran
6. Cardcaptor Sakura
7. Sailor Moon
8. Chrno Crusade
9. Galaxy Angel
10. D.N. Angel

… It is difficult to go through the names of anime I’ve watched over the years… There are definitely more than 12!

edit: I have decided on watching Sayonara, Zetsubou Sensei

2nd edit:

I have received a quite a few suggestions. Some I’m considering , some I’ve already seen, and some I don’t ever plan on watching for various reasons.

• One Piece
• High School of the Dead
• Trigun
• Soul Eater
• No. 6
• D.N. Angel
• Chrno Crusade
• Chihayafuru
• Guilty Crown
• Penguindrum
• Chrome Shielded Regios
• Usagi Drop

Thanks for all of your suggestions!