Currently, my champion rank is only 125. But this build is what I have been aspiring to work up to as I believe when completed It will offer a lot of sustainability, though not a heck tonne of dps.

For gear, don't know why that's not on there.

Visage of the engine guardian
Pauldron of the engline guardian
4 magnus
4 seducers/krag depending on your capabilities
2 willpower rings/Magicka furnace
I also enchanted all of my armor pieces with magicka glyphs.

You might also want to create your armour with the infused & divines traits as it offers a lot of the best advantages. Yes, I clearly took advantage from everywhere but hey. It's good shit.