Know No Fear: Store event help

[The Madman]

So my local store is doing a Planet Strike battle for the Know No Fear global event GW is doing for the latest Horus Heresy book.

What players need:
For the Forces of the Imperium - one Troops choice and one Heavy Support choice.
For the Forces of Chaos - one Elites choice and one Fast Attack.

As I’m a Word Bearer player I feel it’s a duty to represent the Legion in this event, so I was wondering which two choices would work the best together?

I have models for all the choices and probably all the options as well. So throw in some ideas please.

oh and theres no points limit i can max a unit if required.

EDIT:
for those not familar with the Codex the choices are

Elites:
Chaos Chosen
Chaos Terminators
Chaos Possessed
Chaos Dreadnought

Fast Attack:
Chaos Bikers
Chaos Raptors
Chaos Spawn

[ChacoStylez]

The terminators are a great pick, way more affordable then the standard C:SM version. If you decide to run them with a mark, Slannesh for I:5 for the win!

The dreadnoughts are a viable option now with their rules FAQ'd for going ballistic.

I've never been a fan of the current options for FA. If i had to pick one, the Raptors, run them deep with the max unit amount.

Those would be my options.

[Tynskel]

if you are sticking to a theme:

Spawn!!!!

and chosen.