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Chaos Lord: Mark of Nurgle, Bike, Lightning Claws, Blight Grenades, Aura of Dark Glory

5 Chaos Spawn: Mark of Nurgle

6 Plague Marines: 2 plasma guns
5 Plague Marines: 2 plasma guns

Helldrake: Baleflamer

2 Obliterators: Mark of Nurgle, VotLW

Wall of Martyrs Vengeance Weapon Battery: 2 Icarus Lascannons, 4 barricade sections

Company Command Squad: Vox caster, 3 Grenade Launchers, Astropath
Chimera

Platoon Command Squad: 2 flamers
Vendetta

Infantry Squad: Autocannon, melta bomb (sarge), Power Weapon (sarge)
Infantry Squad: Autocannon, melta bomb (sarge), Power Weapon (sarge), Commisar, Vox Caster

Manticore

Let me know what you think.

People usually take PFists and LClaws on lords. They're both specialist weapons so you get the extra attack, but you can now choose between using either weapon instead of just LCs. Costs 10 extra points though.

Rest of the CSM part of the list looks dandy as far as I can tell.

I don't know IG units, so I can't say anything there. Worse yet, I can't comment on how well the two armies synergize with each other. Good luck! Someday I've got to make a spireguard list...

I agree with changerofways about the Power fist, Lightning claw combo. Not a must have but still nice to be able to multitask.
Two things besides that, you are not able to man the Vengeance weapons batteries and they are only BS 2. They are better
off as battle cannons, that way you can offset the poor shooting by just lobbing shells. The infantry squads with the
autocannons can't make the most out of their autocannons if they move, and they can't make the most of their power
weapons if they sit in cover. I would probably take a more mobile weapon, or just have a dedicated HW team. Otherwise it's
a pretty well built list.

The Lightning claws are there because that is how he is modeled. If I can figure out how to take one hand off of my bike lord without damaging the rest of the model and paint job then he would have a fist as well.

The Firestorm redoubt is the defense piece that cannot be fired manually. I did not see any rules with this concerned to the Vengeance Weapon Battery. Did I miss one somewhere?

The power weapons in the guard squads are there in case the guard get charged. I know the squad is pretty much screwed if that happens, but it was the last 20 pts. Any suggestions as to where that should go instead?

I run a similar list from time to time, and it works well. This is how I would suggest you run it at 1850.

Chaos Lord, Mark of Nurgle, Lightning Claw, Power Fist, Sigil, VOTLW

9x Plague Marines, VOTLW, 2x Plasma, Power Axe, Rhino, Dirge Caster

10x Plague Marines, VOTLW, 2x Melta, Power Axe, Rhino, Dirge Caster

2x Heldrake, Baleflamer

Allied Detachment - Traitor Imperial Guard
Lord Commisar, Power Axe
4x Infantry Platoon (Blob), 2x Melta Bombs, 4x Power Axe
4x Sabre Defense Platforms, Twin Linked Lascannons
2x Field Artillery Battery, Thudd Guns
Aegis Defense Line, Comms Relay

It work's extremely well. Blob goes up the middle, with a plague marine rhino on each side covering each flank. Blob is so big, that you can keep a model in contact with the comms relay until at least turn 3 to help get the drakes in.
Sabres blow up flyers and flying MC's, and Thudds help clear hordes.


And don't worry about what wargear you model on your Lord. A Nurgle Lord runs best with lighting claw\fist in this codex. Just make sure you tell your opponent what he is armed with before the game begins.