I will use it with this weapon and shield:
I want to focus mostly on offensive damage like a Barb feels, and hoping that the Shield Glare CC will be enough to keep me alive. I can always drop Wrathful for another defensive passive like Vigilant if I need it, or switch out my Law for more all res and CC immunity, but I'm hoping I can get some life per Wrath spent gear, too, since this build is going to be very fast at building and spending Wrath. If I don't need the Shield Glare, I can change it to Judgement with Resolved for extra damage with the 80% crit chance.
I also came up with this "Block Crusader" build that I think would be fun to try out: it's all about getting enemies to hit you so you can block them and do stuff with those blocks.
I don't know if Thorns applies when you successfully block, I don't see why it wouldn't but it would be a great build for it. You could replace Insurmountable passive for the Thorns one. I think Shield Cross just sounds cool and fun, but there are better runes for it. You could also use Blessed Shield instead for more versatility, or simply drop Iron Skin for both Blessed Shield and Shield Charge.
Looking into some more of the magic Crusader abilities, I thought about trying something like this:
This build is all about keeping your life per second up while hitting from medium range. I don't really know what the best FoH rune is yet since they sound really complex and requires practicing in game, but this one sounds like the bolts that come off zap enemies like a Monk's Cyclone tornado does in Sweeping Wind for massive AoE.
And finally, I wanted a Holy Bolt Hammerdin to try out for the memories:
This build is all about getting into the center of a mob and spamming Hammers. I went with Limitless for the holy damage, thinking +holy % damage affixes would work well.
What are some theory builds you have?