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Huron Blackheart
20 Chaos Space Marines, 2 plasma guns, mark of nurgle
20 cultists, autoguns, 2 heavy stubbers
5 havocs, 4 heavy bolters, mark of nurgle
10 havocs, 4 melta guns, mark of nurgle

I don't know if this list is horrifically flawed or not... The idea being to use Hurons infiltrate d3 units to get whatever seems most useful to destroy the biggest threat(s).

I would add an hell drake, its a great buy
Also some transport is needed

With all AI stuff running around lately you can't rely on infiltration as much as we could in 4 or 5 ed.
One bad turn 1 and your melta havocs go to dust and you are with nothing to deal with armour 13 not to mention 14
IMO get rid of huron and melta havocs and add Typhus or Sorc and Helldrake instead. As for other havocs reduce them from 10 to 7 max and give them autos instead of hb.
Troops are ok for me. 20 nurgle marines for 1000 pts can do nice, if you would go typhus maybe converst cultist to zombies? Cause they shooting is terrible anyway.

I'd keep Huron- He's pretty cheap for what he does and can help your army with buffs or wreck MEQs in CC- or you could replace him with a Chaos Biker Lord or Sorc.

Split up your CSMs into two groups. Give the 2nd group another set of plasma guns.

Remove the heavy stubbers from the cultists- paying 5 points for a bolter that is "Heavy 3" is not entirely worth it.

Replace Heavy bolters with Autocannons- slim down that squad to 5 members instead of 10. This allows you to stay at range and tackle armoured targets up to AV13 (you won't be able to kill AV13 super effectively, but having the ability never hurt, especially since you'll be shooting 8 rounds with 4 autocannons) You'll also be wounding any infantry target on a roll of 2+

Melta havocs is an interesting concept- I'm guessing they'd be the number one priority for infiltrating. However I would give them a Rhino. Just so you can ensure they'll be able to reach their targets.

A heldrake is also great, as everyone has suggested.