Let's see Genshiken is probably my favorite anime of all time and you haven't watched that lol (manga is better though because for the simple fact that the anime cuts short of where the manga ends but follows the manga perfectly). Air and Clannad are seinen too if you like pure romance/drama anime. Sekirei is coming out in a few days which is going to be awesome though very ecchi. Also there's Rah Xephon and Gun grave. but out of all these i think if you want "intelligent" anime Rah Xephon is the way to go you really have to piece stuff together but overall i thought it was second rate compared to Evangelion which you don't seem to want to watch because it's not really +18. There's loads more if you know where to look...