Well Bellum I couldn't help myself, but I already looked at your gear, and I see that you are much farther into high end stuff than I am. But, i'm a big time number cruncher and theorycrafter
Your first link to your build is a bit heavy in Unholy with some points spent that confused me a bit, however, you did leave out one very important talent.
Both of the specs you linked do not have it. I'm wonderring as to why.
I noticed that the one you built still has 8 points left over, enough to pick up Bladed Armor and Two-Handed Weapon Specialization (both of which are great for threat generation) And you would still have 1 point left over, which I'd probably do something like this:
As to Blood Caked Blade... i've never been a big fan of it, the damage isn't too impressive nor the threat, I leaned more towards Necrosis being that White Hits do make up roughly 30% of our DPS, and a little extra boost is good for both damage and threat.
I'd personally take the three points either out of that, or Wanderring Plague (i'd choose Blood Caked Blade) and top off the Necrosis Talent.
Other than that I do like the build.
That's just my 2 copper, as to what you do with your builds, do whatever is comfortable