So I've tried a few configurations on my Weapon Damage, testing the passive abilities and set bonuses and such, but the only thing that appeared to have an effect on my character sheet's Spell Damage was my weapon's base damage. But I've been told that, although the character sheet doesn't display it outright, those other bonuses to Weapon Damage still have an effect on the outcome.
So my question is, what exactly goes into the final calculation? Would boosting my Weapon Power higher have any effect whatsoever on my Spell Power?