This kind of thread is really, really dull, and also pretty useless since people will usually just recommend what they like, not paying any attention to the theme requested.
Nevertheless I like most of those shows enough that I can't keep from posting some suggestions anyway, no matter how dull I think it is:
If you want to branch out a bit, genre-wise, you could try Kare Kano and Honey & Clover for some very solid romance and comedy. And needless to say, watch every Ghibli movie in existence.
The dullest part of these threads is how people are always too lazy to explain what their suggestions are, or why they suggested them.