Ok finally got home heres my guess at what my DK tank will have

Blood Tank

Here is 2 of the 3 slaves

and finally the utility guy(lets hope he doesnt die early on boss fights as hes my haste, lol.)

So these guys all will be using liberal amounts of Heart Strike, but I gotta figure out exactly what I need. Also I may make my tank do the frost stuff but I really really need an AOE spell and UB is really nice. Guess we will see.