Here is some background information. I have 5 dk's made and I plan on using 4 of them with 1 priest to do pve. When I made them I didnt give it much thought on race. I would like to keep the tank on the same account as my pally tank. From what I have read tauren is best for tank. I also read that orcs are better for dps. The way it stands right now I have an orc on my tank account. Likewise, I have a tauren on one of my dps accounts. I have one Blood Elf on a dps account too wich adds nothing in the area of pve. All the dk's with the exception of the orc on the tank account have max rest xp. They are all lvl 58 sitting in thrallmar inn.

Question:

In the long run, is it worth deleting the following for better group balance? Orc from tank account (replace with tauren), tauren from dps account (replace with orc), and delete Blood Elf from the dps account (replace with orc).

I am already considering spec options that include a frost/unholy tank to provide frost aura and the melee group buff. DPS will include blood aura & unholy aura. In addition I will spec for both the blood and unholy group buffs. At this point I am leaning towards each dps specs that include a perma pet and gargoyle for extra damage. I would appeciate any input on this. The past few days I have been reading up on dk's. My knowledge is still very basic.