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1000 pt competitive list i threw together

hq-
lucius the eternal
-160 pts

troops-
5 noise marines
4 sonic blasters
noise champion
doom siren
power weapon
rhino
extra armour
-215 pts

5 noise marines
4 sonic blasters
noise champion
doom siren
power weapon
rhino
extra armour
-215 pts

9 csm
meltagun
icon of slaanesh
-155 pts

heavy-
chaos land raider (lucious and csm here)
extra armour
possesion
-255 pts

I'm not sure the land raider will pull it's weight in a 1000 point game, you might want to downgrade to a rhino, get some more anti-tank (the landraider isn't going to cut it for AT by itself anyways) and use whatever points you have left for more niosemarines with sonic blasters.

If you are sticking with the Land Raider then at least drop the Extra armor on it, the effects from that are overlapped by Demonic possession so the points are wasted.

Well, I'd go another route, with 1 winged slaaneshi DP,
2 troop units (NM) in Rhinos, and some Obliterators.

The Chaos LR is an ancient machine with just one shot if the tank has moved.

Possession gives it a 2nd shot, but at BS 3.