I second Lamune.
Gift ~Eternal Rainbow~
Da Capo (both seasons)
Futakoi (Not sure if you are going to like the ending, but it is definitely happy)
For comedy/action/romance it does not get much better than
Futakoi Alternative (Not related to Futakoi)
Canvas 2
Hanbun no Tsuki ga Noboru Sora - very good, only 6 eps... only this one has quite a bit of drama.