Now that Dorn Il-Khan is in my party, what weapon should my main take?

When playing an evil party, I normally do a fighter with Great Swords and Bows. Now that Dorn is here, I'm thinking he'll likely be Great Sword focused. I'm thinking maybe Halberds for my main? There's a +2 one in the game and a +1 one you can get early on, and they do a lot of damage. Additionally, I can still use bows which require two hands.

Not sold on it, want to see what you guys think.

Shar-Teel will have my Scimitar +3... and Kagain will have Battle Axes... best sword I can think of for an evil person after that (not counting crap that might be added in BG:EE) is a Longsword +2/+1 Cold Damage...