What about Matt Toomua, Francois steyn, Wesley Fofana, Matt Giteau and Luke McAlister? There'd be more debate amongst some of those than D'Arcy and Twelvetrees. I'd pick Fofana.
I know it's still a bit debateable since he's possibly retired but he does seem to be going through a resurgence, so....where do I vote for D'arcy's beard?