Your choice of Great Poleaxe and Ghost Spear, they'll have the highest damage-over-time ratio (not screendamage)
With Treachery and one other source of IAS you could even go for a Warpike (total IAS of 125+)
Of course, everyone would be entitled to laugh at you should you really make this as even a good Insight will deal the same amount of damage (and prove more useful anyway), not to mention Obedience, Infinity, Reaper's Toll or upped Hone Sundan, each of those out-performs BotD on most counts :tongue: