I would probably go 4x Elemental on the Shaman.
You can go 1x Resto, but 4x Elemental will easily cover all 5-man healing.
And as Elemental, you'll kill a lot faster and do heroics in less time.

For the Druid, dual-spec.
Go Feral for heroics, or anything you need a tank for.
And go Balance for PvP.
Again, the 4x Elemental will be plenty of healing, so the Balance won't need to drop the form to heal.
Pretty much manage Eclipse on the toon you are actively controlling, with Shammies as slaves.
You'll run Balance/Elemental x4, for most PvE and for PvP, with a tank when you need one.