I use flesh hounds, two units of 5 with a Herald on Juggernaut.
It's relatively cheap, 2 denies on a fast base which pumps out a lot of str 6 ap-1 d1 attacks each when it is charged/charges and can horribly mangle most screens, whilst looking scarier than they really are.
In mono khorne I give them a c. In mixed daemons I rate them as B as mobile, cheap denies are always fantastic and will eat non elite infantry or any MEQ without invuns for breakfast.
Skullcannons - points for effect - actually surprisingly good. the model is god awful to paint but for point effectiveness it's kinda funny Khorne provides the best long range fire support.