@CKO - I was playing against mostly infantry chaos marines, and I didn't keep a count, but the only notable kill apart from "some chaos marines" was a vindicator, which took 9 St6 hits in the side.
TBH, I tend to fire units in a rolling wave against one squad until that squad is dead (It was a KP game), so the infantry kills blurred into one. The real utility of the squad was the ability to punch out loads of S6 shots, at a long range and keep moving (backwards) at the same time.
You could quite easily do Chaos Guard/LaTD list with the new Guard codex. In particular:-
Straken makes a good renegade marine commander, or a Commissar Lord works well as the classic cultist demagogue/bond villain.
Penal troopers make good nasty flayerkin-esque mutants, or even lesser demons in a pinch.
Combined squads or conscripts make for good loser mutants, or crazed/rubbish cultist hordes. If you want the old school fearless cultists, e.g. Infardi, just add commissars as demagogues/enforcers.
Ogryns make good big mutants...mostly because they're big mutants.
Psi squads and the Primaris Psyker feel "right" in the list.
Banewolves and Deathstrikes have a good evil WMD feel to them.
Everything else can be done with a decent Evil colour scheme and spikes to be a "traitor russ/hellhound/Hydra/Vendetta", whatever. Just make sure it has skulls on it
If you're an Abnett fan, veterans are a good way to represent blood pact, as are any "professional soldier" guard unit, and armoured sentinels make good stalk-tanks. All of this would, in my mind, be well represented by the lovely forge world renegades, but that's just me.