The others aren't wrong. You are getting nothing out of that Inna's Belt. To be frank, they really aren't even good for monks. They only use them because you get to cast Spirit Wind pretty much for free, which gives them that 50% of their spirit for other attacks, or for spamming Conviction. The % Holy damage and 1% CC aren't worth the primary stat, EHP boost, IAS and CD from a Witching Hour, Pick-up radius, or anything else that you are getting from the Inna's. It is terrible belt. If funds are the concern, an EHP boosting rare (super cheap these days) would serve you better than the Inna's.
Also, there is a reason you can barely find any 2H's other than a Skorn. There is nothing better than that one. It can get any and every weapon stat you could ask for, and you can get good ones cheap thanks for the obscene amount of them available on the AH.
Finally, I agree with you that Avg Damage is good, but not if you stack that and nothing else. I would think that high CD and CC coupled with Avg Damage would be your goal, seeing as that you are looking to deal the most damage possible in a single cast. Look for a good Intelligence Unity. They have have everything you are looking for, even though the LoH would be useless for your build and gear spec.