I'll be trying to update the OP soon. I've also changed it to reflect the fact that most of the "top" anime were mainstreamed onto American television, thus explaining their high position on the ladder.
I'll cast my vote here, as well:
AnoHana
Attack on Titan
Clannad + After Story
Code Geass
Eden of the East
ef: A Tale of Memories/Melodies
Fate/Zero
Girls und Panzer
Ghost in the Shell
Gunslinger Girl
Haruhi Suzumiya
Hataraku Maou-sama!
Kami-sama no Memo-chou (Heaven's Memo Pad)
Kara no Kyoukai (Garden of Sinners) Series
OreImo
Psycho-Pass
Puella Magi Madoka Magica (+ Rebellion Story)
Shin Sekai Yori (From the New World)
Spice and Wolf
Steins;Gate (+ Fuka Ryouiki no Déjà vu)
Toradora!
Usagi Drop
Going through trying to re-tally all the votes for accuracy, only done with page 2 and... 149 anime, this'll take a bit of time.
Page 5, 236 anime... don't know if I'll survive... back hurts... from typing for so long...