Devastation/Reap Spirit Spellbinder Idea

So I was trying to put together more combs with a necromancer and aether damage in particular.

I was thinking a Spellbinder using devastation, reap spirit, and siphon souls. Since siphon souls is a melee-ish range ability, I planned on doing some melee and got reaping strike. Is this a terrible idea?

Here is the Spellbinder build. I would love feedback on any of my choices.