I'd go for the +1 poison (that's the assassin's dagger, right?). On a stack that does 1-3 damage it'd increase to 2-4. That means between 33% to 100% increase in damage. The weapon with +4 attack would give something like 13% increase in damage.
And of course, I agree that you should get Xeona ASAP and wield ALL those weapons, including Isshara's whip.
KD
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