Nice Jon, since you just named the list I played against you the other night. Hah.
I'd go with 3 blocks of about 30 infantry, a mix of core and elites, especially if you're buffed by shadow magic. Mind razor is awesome for spearmen, witch elves or whichever.
With the FAQ from 8th ed, the cauldron of blood is even better than before, which makes executioners better than ever. It is also nice that you get to attack from ranks.
Black guard are still good, but not like before. Many DE players are leaving them at home in favor of executioners or cheaper multi-attack guys who you can buff.
The OP model is the unkillable/unbreakable dreadlord on a pegasus to tie up the horde units while the rest of your army destroys things.