Honey & Clover? Really? I hated that show, and personally would not recommend it at all. Nodame Cantabile is excellent though, although I've never managed to finish it. I tried the live action version recently, but was put off by the atrocious acting.
Clannad's first season is good, but nothing special. It's well written enough, but the drama tends to feel a bit... unimportant, if you will. It's the usual kind of high school anime drama you'd expect from a normal VN/eroge adaptation. After Story, on the other hand, is a lot better (after the first few episodes), has some brilliant characters and writing, and some real, heart-wrenching drama. You need to have watched the first season to have a clue what's going on, though.