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Dante might throw you out some more options. Dante allows you to palm off sanguinary guard as troop choices. SO... you could take up to 6 sanguinary guard squads, all as scoring units (IIRC), without using up any elite slots.

Since all Sanguinary guard can be kitted out with infurnus pistols, I wouldn't worry too much about giving your HG plasma.

Sanguinary guard joined to Dante don't scatter on DS, so you can just plant them next to any tank you like and it's dead. Even if they get assaulted Dante gives them the Hit and Run special rule, so they can just fly off and go pop another tank. Much more effective than melta HG.

I dunno how SG would fair against TWC. The Angelus boltgun is assault 2, so a bunch of SG could rattle off a fair few shots, and they can take plasma pistols (not plasma guns unfortunately). They also have the master crafted power weapon, 2+ save, and can benefit from the chapter banner. And FNP if you trow in a Sanguinary Priest (which you can if you are buying SG from your troop slots). Pretty solid units, I would rate them above terminators just for maneuverability.

EDIT: Also Death Masks... Can give them an edge over other units on assault. I can't remember if TWC are fearless or what not? Though if not failing any morale test could see them disappearing pretty quickly off the table edge.