[Moonkin Aura + Heart of the Crusader] vs [Ebon Plaguebringer + Totem of Wrath]
I'm pretty sure moonkin aura and heart of the crusader stack:
Blizzard's official comment about changes to stacking buffs in WOTLK. Comprehensive list of buffs inside.
Although shamans are far and away the most popular DPS class with 5-boxing, it's really seeming to polarize into DK+shammy teams and Pally+moonkin teams. DKs offer the debuff (Ebon Plaguebringer) that moonkins provide (Earth and Moon), whereas pallys offer the debuff (Heart of the Crusader) that totem of wrath applies.
Since it's probably recommended to have at least one shaman in the group (fear protection) the DK team (with shaman DPS) does get the benefit of choosing a non-shaman healer. They also get the healing stream totems that seem to be worth their weight in gold. And, of course, four elemental shamans can probably DPS + heal much better than moonkin DPS + heal due to the AoE heals and not having to shapeshift for maximum damage.
Anyway, I'm just researching my team and found this interesting. It's probably well known to the seasoned boxers, but some new folks may want to consider the mixture when rolling a new group.