I was thinking of this
HQ
Sorcerer with gift of chaos familiar wind of chaos and termi Armour=200
Elites
5x possessed marines with mark of nurgle and champ=190
Troops
10x chaos marines with mark of nurgle heavy bolter and meltagun=220
10x plague marines with 2 plasma guns =250
8 khorn berzerkers with 2 plasma guns in a Rino with pintol mounted combi-melta=243
fast attack
5x chaos bikers 2 plasma guns mark of nurgle one is a champ with power fist plasma pistol and melta bombs=305
heavy
obliterator=75
as you can see I like plasma guns but they always overheat anyhow I would send my bikers after tanks
HQs or monstrous creatures while my
berzerkers go for large amounts of troops my chaos marines will lay down cover fire with my obliterator then my plague marines with my sorcerer and possessed move up to capture objectives