SilverMK2 gave some excellent advice.
Chaos Lords are pretty poor, and the Khornate
DW is the worst possible option for them. They're usuable for
HtH with lightning claws , with no mark and a daemon weapon, or with the nurgle
DW. But a
DP is almost always better/cheaper. Sorcerers are good; as you said, in a Rhino is smart. Abby is good in a
LR, but he's a lot of points and better in larger games. Greater Daemons are nice, cheap
MCs. The only issue is the delivery system.
I've recently been getting fonder of Chaos Dreads. As Silver said, they're one of the only places to get a plasmacannon. Even better, though, for my money is the
ML option. This is only 100pts and gives you another 48" range antitank gun, which is normally only easily found in the
HS slots. If he happens to go fire frenzy on your own stuff, make sure it's a hard target like a Rhino, and just fire Frag.
Suggested list:
DP w/wings, Nurgle, Warp Time: 185
Sorc w/wings,
MoS, Lash: 145
Greater Daemon: 100
Dread w/
ML: 100
Dread w/
ML: 100
5x Chosen w/3x Melta, 1x flamer, naked champ: 135
8 Berserkers w/Fist Champ, Icon: 213
in Rhino w/Combi-melta: 45
10
CSMs w/2x melta, Icon of Glory,
PW Champ: 210
in Rhino w/Combi-melta: 45
5x
LD: 65
5x
LD: 65
3x bikes w/2 flamers, naked champ: 124
5 Havocs w/4xML, Icon of Glory: 165
2 Oblits: 150
1847
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This is not too-dissimilar to a list I used recently in a large
RTT, taking 3rd and tabling Tau and Deathwing, and beating
SW solidly. My list has terminators, a second squad of Oblits, only one Dread and no
GD or bikes, but this works similarly.
The Chosen and Bikes can both act as delivery systems for the
GD. The Chosen are great at Outflanking to kill tanks hiding in a corner, or just shoot and charge units like Longfangs. Either can be used to contest objectives in the enemy backfield, and the Bikes with their flamers can clear out squishy objective-holding units like Scouts, Pathfinders, or Grots who rely on cover to survive. Be sure to Turbo the Bikes on turn one to the best-hidden position you can get that's close to the enemy for delivering the
GD if he shows up on turn 2. If he doesn't, keep them safe and hidden, and you might get lucky and have the Chosen show up first; which can give you a chance of having a
GD pop up in the enemy DZ.
The
LDs are purely for holding objectives at a low cost. Use cover with them and don't forget they can still Go To Ground for a 3+ save if in cover holding an objective.
The
DP,
GD, Dreads and Zerks are your main assault elements, though the
CSMs certainly aren't bad at it. They aren't as durable as
PMs (except in cover, against weapons of S7+ which deny
FNP; against which they're superior), but have greater offensive output.
Oblits, Havocs, and Dread
MLs need to focus on enemy transports, particularly fast-movers first. The havocs or Oblits also have a fun secondary trick combined with Lash- bunch up a squad for 10-15 hits from a single blast template and let fly with 4 frags or 2 plasma. My record is over 40 Frag hits in a single round.