Looking for suggestions

So far I have watched:

Death Note (amazing,but got a bit boring and too slow after L died)
Code Geass (my personal favourite,perfect balance between action and an actual storyline)
Mirai Nikki (great,awesome opening,except I think Yuki is a bit too stupid and I hate his random scream parts,if you know what I mean.)
Sacred Seven (It's good)
Steins;Gate (Amazing,awesome storyline,no fanservice at all which is a good thing,and the dirty jokes were actually funny)
Strike Witches (it's allright except the weird camera angles if you know what I mean)
Guilty Crown (except Gai's deus ex machina kind of ass-pulls it is allright,it has good soundtrack but things happen way too fast,it is wasting its potential)

So,what I am looking for is an anime with a good plot,lots of intelligent plot twists,least possible amount of plot holes and fanservice.

That would be great,and thanks in advance.

By the way,I was told about Darker than Black before and I am looking into it,but so far I couldn't find it anywhere so please don't mention it.