Mine would have to be the Master of the Ravenwing, the parts just wont align properly, I finally had to file down large parts and add GS to make it look good.
"Cast down the idols! Destroy the temples! Slay the priests! Show these fools that they worship nothing more than a rotting corpse!" - Dark Apostle Harzhan of the Word Bearers
"It is my sacred duty to save your soul from the Dark Gods of Chaos... and I will save your soul, even if you die in the process."