Looking for dual-box combo suggestions

[Ualaa]

DK's have their own phased region.
Other DK's at their same stage of questing can interact with you, but those behind or ahead cannot.
Once they complete the quest line, for the final battle.. they are out of phase from those who have not done so.

Basically a DK starts at 55th, and will be late 57th or early 58th, as they leave their starting area.
At that point, they will have the correct number of talent points for a toon of their level.
But the get an epic mount free, and know all pre-Outland flight paths, etc.
And have very cool looking armor, which is quite decent for upper 50's or lower 60's.

[myrddin]

I started a DK last night to get some practical experience before deciding one way or the other

So far, seems like playing a warlock, the pet feels like my felguard, I have dots and double deathcoil ^^, only downside is I have to be in melee range to apply dots - but now I have a bigass axe, and plate =D

Thinking about it, I can do all my outland leveling with the druid healing me but not grouped - benefit of being less gankable, and minimal downtim, and no exp penalty - looking to min-max talents to be efficient from a damage output perspective, rather than efficiency of damage / regen. Still researching that, gone unholy for now.

What is the state of 5mans with reguard to healing complexity? Unless its unmanagable with a DK mainscreen, I think this might be my favourite duo of the options.