I wanted a team for Northrend but decided I wanted to do this with minimal effort.
So I took stock of what characters I had lying around.

Initially I discounted this team as it was melee heavy - but the longer I thought about it the more I figured Why not just try it.

Looking at the highest level characters available to me I came up with the following group make up:

Feral Druid. level 80 (Tank - would have been the tank on any group I made)
Ehancement shaman level 76 (currently elemental but will switch to enhancement)
Retribution Pally level 73
Unholy deathknight level 73
Holy or disc priest level 64

I know macroing this together will be a considerable challenge.
Buff wise it will be quite nice.
I still have the utility that one shaman brings... groundings, poison cleansing etc, reincarnation (only 1 though )
Still some CC with hibernate, entangling roots, repentance, hex (eventually)
Nice AOE with consecration, death and decay, magma totem and disease spreading. Not to mention that Consecrate and DnD
will make some pulls easier on the druid.

Obviously I've given the rose tinted positives to this composition and I'm fully prepared for failure - What do you think will be my biggest problems.