I'm really thinking of a melee team.
The focus for this will be PvP.

I'd arena, as a means to gear for battlegrounds.
Preferring rated battlegrounds, once that comes into play.

I'll be playing all five toons myself.

I already have druids in the lower 70's now.
Was originally going Balance, for battleground PvP.
Have not actually switched them yet, but the lack of burst is a strong consideration.

So my choices are:
a) DK + 4x Ret.
b) 5x Rogue.
c) 5x Feral.

Which would you do, and why?