I think a mix and match would work well.

1 DK / 1-2 Rets/ 1 War / 1 Feral Druid

With this combo you get all the DK buffs, Might buff / 10% AP / Group heal / 20% group haste. A Snare and a Deathgrip
Warrior provides MS / and Commanding Shout
2 Rets provide 2 blessings/judgments - pick whatever is crucial to you
Feral Druid gives you the crit bonus and heal + Mark.

With some nifty clickmacro's I'm sure there is a relatively decent macro to spam out for each character without too much focus, and if any 1 class gets a nerf it isn't as big of a deal - if this combo actually works it has the good long term viability instead of a flavor of the month style.