Either enhance or elemental will do fine, depending on what you want to do.
Your warlock friend will love you for totem of wrath, but your druid tank and hunter will love you for Grace of Air.
If the warlock decides to go affliction, I would say go enhance just to give you some melee DPS. As affliction the warlock won't need the +hit from Totem of Wrath quite so much and as enhance you can drop Grace of Air, Strength of Earth, MAna Spring, and whatever fire totem you want.
It really comes down to which you prefer more. If you like being a caster, being elemental isn't gonna kill your party in that case and you will be able to do sick DPS on some of the normal 5-man stand and shoot boss fights AND you won't be fighting with the hunter for gear.
Actually, now that I think of that elemental makes more sense for that simple reason. All 5 characters will have specific types of gear they are looking for and there won't be any squabbles over who gets what gear.
Go elemental. I just respecced to it and am loving it.