I don't know if you're still keeping track of this thread, but I'd offer a different view.
I'd bring Daemon of Khorne, Chaos Armour, Scaled Skin, Soul Feeder, Flaming Breath, and Dawnstone. Yes, he doesn't get the fanciness of his other gear, but a 2+ re-rollably is pretty crazy and better in pretty much every situation. He's killy enough with Flaming Breath, 5 WS9 attacks and Thunderstomp, and he won't be going anywhere due to Unbreakable/Soul Feeder if he loses (he's usually going to regain all of his wounds in the turn he breathes fire, and usually one or two wounds per round otherwise), and mobility to get into the side/killpower to rack up combat res/sheer durability to make sure he wins the fight.
The exception is if you face loads of Lore of Metal, in which case the Dragonbane Gem is pretty much mandatory to stop him dying to a single casting of Searing Doom.
