I liked the catachan models and in particular I liked the special characters so I decided to try to design a list that incorporated those three. I also thought that it would be fun to run a Callidus together with Marbo so that required some DH allies. This is the proposed list. Is there some way to make it more competetive without removing the features as described above? In particular I wonder if the grenade launchers are worth their points.

HQ:
Company command squad
Straken
Regimental Standard
Medic
2*Plasma Gun
2*Bodyguard
Carp Armour
Comment: Supports (mostly the HWS) with orders, morale, plasma and CC.
270p

Inquisition lord
Power weapon
Close combat weapons
Psychic Hood
2*Mystic
3*Warriors (Veteran Guardsmen)
3*Plasmaguns
Comment: Add plasma and protection against psykers, deepstrikers and deamons. Will babysit the artillery. No servitors is there because of mindlock.
149p

Troops:
Veteran squad
3*Grenade Launchers
Autocannon
Harker
Comment: Try to stay in cover near an objective an hold out as good as they can while spraying the enemy with HB, AC and LG shots.
150p

2*Infantry squad
Grenade Launcher
Mortar
Comment: High AV killer.
120p

Plutoon command squad
4*Flamer
Comment: Counter attack unit.
55p

Heavy Weapon squad
3*Lascannon
105p
Comment: Destroy vehicles and MC.

Heavy Weapon squad
3*Autocannon
75p
Comment: Destroy light vehicles and MC.

Elites:
Marbo
65p
Comment: Tries to find some nice targets for maximum damage. If Marbo appear near Straken he gains a dangerous charge.
Callidus Assasin
120p
Comment: Tries to find some nice targets for maximum damage. If Callidus appear near Straken it gains a dangerous charge.

Heavy Support:
Medusa
Shell
140p
Comment: Tank killer or just general killer.
2*Basilisk
250p
Comment: Long range barrage artillery.

=1499p