Regarding Willsapper vs Red Blade... A 60 warrior with some raid gear should be capping Stamina. You lose 15 HP and 5 resists swapping. However you gain 9 AC, more Melee aggro and more proc aggro. It's a no brainer swap. I can't think of when red blade is superior. When do 5 resists matter? And 15 HP vs 9 AC... See below.
http://www.project1999.com/forums/sh...0&postcount=42
According to Rogean, AC is King on important fights where tank survival is the paramount concern (AoW, Tunare, Vyemm).
When the person who can see and codes the AC calculations says AC is very important; I would be focusing on that.
Therefore Giant armor > Dragon armor for tanks.
In summary - Vulak or AoW rings should be tank only. 30 AC ring is tank ring. Same with Pauldrons of Deep Flames, Dozekar Wrists. Them ACs are win.