So I have a Tauren DK that I play on Baelgun as an attempt to get away from Alliance and Guild stuff for a bit. He is unguilded and unless a really cool Casual guild comes along he will stay that way his whole life. I jsut cna't decide on teh best spec for him.
I played my DK to 68 at the moment as unholy.
As talents I basically avoided the tanking talents and only went for dps talents. The World of Warcraft Armory
Notable things I like: On a pale horse: 20% faster riding on your horse, Master of Ghouls: Makes your ghoul permanen and Scourge Strike as your hard hitter.
This build has good single target but also good aoe damage. I even managed to tank pretty well with it on some pugs, even without any damage reduction talents except for bone shield which is too nice to leave out.
Next time I would leave out my gargoyle, I don't seem to come into situations where I need it.
Normally I would start with icy touch and plague strike to get diseases up, after that mostly a scourge strike and then the mob would be almost dead. Sometimes replacing scourge strike with death strike to regain some health.
Also I like the glyph which removes the cooldown on death grip when you kill a mob, it gives you high speed.
I see that you have a lvl 80 main: bloodied arcanite reaper, while you can't runeforge it, it's mint.