I started tanking Brutallus for a couple of weeks, don't exactly remember my gear (as I logged out with DPS, but I can check later when I get home), but you might want to check out the
[Signet of Eternal Life], which drops in ZA. Stat-wise, it's very similar to the one that drops off Supremus (
[Band of the Abyssal Lord]), and with this it would be easier to reach the cap.
For Brutallus you'd rather not rely on elixirs or flasks to go over the crit cap.