5x ele shamans vs 4 ele shamans+1 druid tank

[nodoze]

Since you already have a 60 Shaman at cap, assuming you level up a shaman team and don't switch to something else, I would definitely level up a Tank+4Shaman team.

My initial thought was that I would put the Tank on my current Shaman account so that once the team is at cap I would have the option to go 5 shaman or 4shaman+Tank but that may be problematic if, after you get the 5 man team to cap, you still view your current Shaman as your main and always want him to be in the group (whether the tank is in the group for that session or not).

Tank option-wise Warriors are the proto-typical choice but I think Druid fits your goals better and is more versatile as you could also use the Druid in ranged DPS mode from time to time (or even do some healing with it).