Shingetsutan Tsukihime is really good and from Type-Moon like Fate-stay night.
If you can try out Rurouni Kenshin it's a little older but really good
Why not trying out Heroic Age too.
E`s Otherwise
Code GEASS of course.
But it all depend on what kind of serie you'd like to see next and if you'd like to watch short series of little eps or long one.
But at least you should try Code GEASS and Tsukihime, they are really really ones.