1. Tenchi: Every series. My favorite series of all time and the reason I watch anime now. I'm biased about this.
2. Rumbling Hearts: Very dramatic, but gripping. I'm not a fan of the romantic genre because of how predictable it gets, but I couldn't tell what was going to happen next in this series.
3.Clannad: I'm still watching After Story. Great artwork and the main character has some depth. Although he picked the wrong girl like all main characters in harems.
His & Her Circumstances: This would be #2 if there was a 2nd season to finish some of things they started towards the end of it. Great side characters to keep things light and outstanding music to add to those dramatic moments. I loved this series.
Fruits Basket: Another show that had alot of potential but didn't have a 2nd season that would have made it legendary. This series has the most deep characters I've come across in anime. Besides good story telling.[/SIZE]
P.S. I don't know how I forgot about Seto no Hana-whatever. One of few series that made me laugh out loud.[/SIZE]