I've been influenced by some of the discussion in the past few weeks and I'm transitioning into complete War Metal/Barbarian Metal mode:
Blasphemy - everything
Beherit - OoBB, DDtM, In the Devil's Studio, and a few odds and ends from demos
Bolt Thrower - In Battle there is no Law
Nothing fancy or refined.
And if we're going to listen to His Majesty at the Swamp, then we also need to listen to Genesis of Apocryphal Desire!