Soloing Corporeal Beast@!@!@! What Wep?!

Hi, I plan on Soloing the Corporeal Beast ^_^

I have about 250mil for this.

What I plan to use:

Helm: Helm of Neitznot
Body: Morrigan's Leather body
Legs: Morrigan's Leather Chaps
Cape: Firecape
Boots: Dragon boots
Ring: Ring of Wealth
Gloves: Barrows Gloves
Shield: (If it's a one handed weapon that you guys choose, then Dragonfire shield)
Amulet: Amulet of Fury

I have 99 prayer, and I'd have 99 herblore in about 20 hours. < I can make Overloads and I have Turmoil (Curse Prayers).

So, what weapon do you all suggest? Bare in mind Corporeal Beast is weak against the stab style.

I have in mind: Chaotic Rapier/Chaotic Longsword/Vesta's Spear/Zamorak Spear < but since Money is not a problem, I don't think I need to consider the Zamorak Spear.

So, is Chaotic weapons the way to go? Or will the Vesta's Spear do nicely?

ALL information on the Corporeal Beast: http://runescape.wikia.com/wiki/Corporeal_Beast < please read it before posting, there's a section on its weakness towards stab attacks etc, but spears only.

Also, bare in mind that if I do use a Chaotic Weapon, it will be along with a dragonfire shield < or any that you may propose (250mil limit though... Elysian spirit shield?)

Thankyou

Edit: I have 99str 99att 90def 99hp 95 mage 80 range.
Edit 2: I will also be using a War Tortoise.