I prefer using the Black Heart with a Brewfest Trinket. It provides stamina, yet has a nice added effect. The Monarch Crab can be useful, depending on your gems in it. It can be a more avoidance oriented trinket or just used to boost Expertise/Hit.
For general usage: Black heart + Brewfest
Specialized usage: Brewfest + Crab(again, depends on you)
This, however, is entirely up to you. My Shaman is the JC so I don't use the Crab for tanking purposes. I like the Black Heart for the armor as a Death Knight.