Maybe a simple fine tuning is required. I see these dudes being used as a screen or clean up. Here's an army:
2x Death Knights 120
Taelord the Kyrie Warrioir 180
2x Omnicron Snipers 200
500 points
or
3x Death Knights 180
Taelord the Kyrie Warrior 180
2x Omnicron Snipers 200
Guilty Mcreech 30
Isamu 10
600
this is probably one of the better ones that ought to be used if you decide to field DK's.
Zarrath