If you put the chanter on slows, the shaman can concentrate on healing... and then add the mage for more dps out of those 3 (a rogue would be better but hey). He can dish out some nice weps for the chanter charmed pet too ;)

Druid ports aren't hard to find, the DS doesn't add much really for its recast time in a group like that. If you added a 5th I'd add a 2nd healer of some sort.

I would go with mage if no other option. Ideally would be monk/ranger/rogue.

Yeah. Chanter and Shaman are set. They're RL friends, seem to like what they're doing. Tank seems to be between 2-3 they always group with. Warrior being most common. Druid was my go to since they're the most versatile of the bunch with an assling exp bonus to boot. I guess monk would be awesome, too, but barring some rich retiring/philanthropist player handing me some monk gear, I think Mage or Druid is going to be the choice. I do believe Druids farm gear better than Mages when solo, correct? That might be the deciding factor, as my long term goal is a Ranger, Rogue or Monk.