60 dk should be fine. your alts may aggro the first mobs immediately on zoning in so go in with the dk first to be ready. then i generally grab everyone up to the first boss and drag them back to your alts at the gate. then have the prisoner dude open the gate to the courtyard. after that youll have to figure out what youre comfy with. some of the mobs have a silence and some have a magic immune buff so be aware of that.