For Ranger you have the Bonus Long bow (darksteel) and flatbow (nervermore) - both you can upgrade with +18% vs Charrs. So no dropable bow in pre can reach this dmg.
If u wanna Play melee, you have Bonus Sword (Eotn pre order). Ist upgradeable with +18% vs Charrs, too So no sword can reach this dmg. But there is no Bonus Axe item. If u want Play with axe, u need a purple one from Charrs,
For mes, u have a nice Bonus wand. But you Need a offhand. The quest Charr shield is very good. only a few, very rare purple items are better.
For Ele, the ◾Hourglass Staff is very usefull. Because purple ele weapons with usefull mods are very rare.
For Necro: ◾Hourglass Staff , or purple Nec death staff (not very rare)
For Monk the proph preorder item Zensors Idol is very good
And the Bonus shield isnt good, because vanguard Bonus ignore the 16 AR.
But the quest Charr shield with 10AR Charr and 15 HP is very usefull
Only a purple shield with 9 AR vs Charrs and >=21 hp can kick it
Even a pruple shield with +8 AR vs Charrs and 26 hp can´t reach it
Edit: Best for Caste (E, Me, Mo, Nec) is a wand and offhand with 18/18 | 18/18 fire, dom, smite, death
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Except +15hp is not useful until you drop to <15hp, until you're low HP you're better off using an extra defense OR offense set instead of +HP, then IF you drop low HP switch to a high HP set (28hp sword/axe + 30hp bonus shield).
So a Charr Shield with -2^Ench/Stance/Hex or +1/xx% Magic or a fancy dualmod offhand or a dual defense staff arguably provides more value