Has anyone found any two one-handed weapons that will match the damage output of the Sundering Cleaver (97-119 Damage, +2 Strength, +1 Warfare, -0.2 Movement, unlocks Overpower)? I haven't seen any. With Enrage up, I'm doing over 300 damage Crippling Blows (which are AoE).

Having two melee weapons improves melee ability damage over just having one.

Having two wands has some benefits and drawbacks. You generally want to be able to wand out air damage so you can electrify water, blood, and steam, but if your air wand is a little lackluster on damage, you'll want to dual wield it with another wand that's better for damage. You also gain the stats of both wands (if they have any). The drawback is that with two wands you're paying 2 AP per attack, and you're getting less damage per turn than if you'd just had the higher-damage wand equipped. One workaround for the latter part there is, when you don't need both elements anymore, just unequip the weaker wand.

Having one 1h melee weapon and no shield would be good for a spellsword type build, since you wouldn't be losing ability damage.