I've been running 4 Wizards / 3 Wizards + Monk with a very similar build to Ellay. I've been using Frost Nova Bone Chill instead of Black Hole though, and I run Conflagration passive on the Wiz that I use Magic Weapon Ignite on. Bone Chill is nice when I'm using the monk - pull everything in and rotate freezes + an extra 33% damage bonus on top of all the bonuses from the monk. I really like the idea of using round robin for Black Hole instead of Frost Nova though, so I'll give that a try and see how it goes.

I agree with the mobility thing. I'm considering trying barbs or WDs because of it, but the damage that a Wiz can put out without needing build specific legendaries is really nice.