I saved the legendary halberd from being on the same tier as the ancient comp bow/warhammer. Your original version had 2 spells on it, but you wanted it priced at or below ancient yumi level.
I could give you the hits for a new ancient weapon to fit into any price range, the problem is that the new change hit X to Y deed has actually broken the paradigm on end game weapons. The ancient comp bow/warhammer is actually no longer the best base weapon in the game with these deeds in existence. Any old looted 5x58 is now (theoretically) better than the ancient weps. You just need to buy 3 - 5 X to Y deeds (at a cool 1.5billion gp) and you have a better weapon than any ancient weapon.
Due to thus I personally don't see the need for a new ancient weapon. I think you could/should just chuck in an ancient comp bow and yumi again. Haven't had the comp bow for a while.
If you really want a new ancient weapon let us know where you want it to fit (I.e. better than yumi but worse than comp bow, or better than everything so far) and I, or the community, can provide the stats.