Right now, my Wizard team is incredibly much tougher than my Demon Hunter was.

First, when you have 4 stacks of Tal Rasha, it means that you have 100% more resistance to Fire, Cold, Arcane and Lightning. And, since Wizards have high Intelligence, they are already in the 1.5k+ range, so we're talking 3.3k+ resistance there. That helps a lot.

Then Energy Armor + Force Armor, a no-brainer for high GRs.

But once again, I haven't tried the new DH sets...