I would lean towards a Tank + Healer + 3x Hunters, for PvE content such as heroics.

However, for BG's 5x Hunters is probably stronger.

I could see a tank type (who can dual-spec to Heals or DPS) and a healer type doing okay, with 3x Hunters in battlegrounds. I don't see 5x Hunters clearing many heroics, even with resilience changes. So, if you're running both aspects with the same group, I'd go Tank + Heals + 3x Hunters.

Maybe a Feral Druid for the tank and a Resto Shaman for the heals.
Of the tank options, I like the druid the best for complimenting a hunter dps team.
The resto brings totems to complement melee, and bloodlust/heroism.