I am going to start a Healer + 4 frost DK group and I am wondering how you setup the group while lvling through PVE. Did you lead with the healer and not have a set Tank and heal who ever has agro or lead from a Blood Dk?

Also now with the XP nerf for doing content below your level, am I going to be affected by using a lvl 80 shaman or Pally to heal 4 lvl 60 DKs? Or should I use my 60 Priest instead and then switch to Pally or Shaman for PVP? Thanks in advance for the help.