Something worth a watch

I'm looking something similiar to Clannad: something that is as well-animated, has a similiar art style and has a good plot. I can stand small amounts of fanservice and ecchi, but something like ultrabigb00bies do not make me happy (example: Highschool of the Dead).

Here's a list of my favorite animes (not in a order), so far:
Clannad (#1)
Kanon 2006
Angel Beats
Toradora!
Elfen Lied
Seto no Hanayome
Hellsing Ultimate
Code Geass
Gurren-Lagann
K-On!
Hayate no Gotoku
Lucky Star

So, please suggest me some anime in the veins of Clannad!