Clannad was mostly just okay for me when I watched it, but you really just have to force yourself through it to watch the masterpiece that is After Story. I have some issues with After Story, but Ushio more than makes up for all of them for me.

I just got my hands on the box set for Evangelion, so I'm definitely going to start watching that again soon. I'm thinking about rewatching Boogiepop Phantom after that just because I haven't watched it since buying the box set.