Kanon, Clannad, Air....the great Key + KyoAni anime. If you can't stand the harem mushiness, then the shows aren't for you. But as you said, Kanon (and the other shows) are quite impressive technically. Art and direction is top notch and always puts me close to tears. Music is awesome too.
Kurenai was a sleeper hit for me. Some parts the art was dodgy....and the plot point where
was kinda controversial....but i love the characters. I don't consider it harem though.
Kiki....i was pretty bored watching it.