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Hello,
I'm revising my army list again but I still think something is lacking. Could you give me advice on what I should spend remaining points for my army to be more viable? It's more relaxed, not so much min-maxing list but I'd still like to win some of my games.

Skitarii: Formation - Skitarii Maniple - Primary

Troops:
Vanguards (10) with 3 Plasma Calivers - Warlord

Vanguards (10) with 3 Arc Rifles

Vanguards (10) with 3 Arc Rifles

Heavy Support:
2 Onager Dunecrawlers with Eradication Beamers

Onager Dunecrawler with Icarus array and Cognis Manipulator

Cult Mechanicus: Formation - Battle Congregation

HQ:
Techpriest Dominus with Macrostubber and Eradication Ray (mini Onager that can cover my "plasma ball of doom")

Troops:
Breachers(3) with Heavy Arc Rifles

Breachers(3) with Heavy Arc Rifles

This is what I want my army to be from the "factor of cool" standpoint. I like how they look, like how the models react on the board, but it leaves me with 260 points. What should I add to my list for it to stand any chance against whatever people will throw at me?

If your set on Breachers I'd have a unit of each, breachers and grav destroyers. Offers more flexibility.
I am not a fan of the Beamer dune crawlers. Nuetron or Icarus is the ticket in my opinion.
A bunker is a nice addition to this army with an escape hatch. Gives your Kataphrons a place to stay safe and gives extra movement with the hatch.
An inquisitor with servo skulls is a cheap cool unit to limit scouts and what not. I'd also recommend some dragoons so you have some units moving forward.

If there was any way for you to free up 30 points you could have a stock unit of Kastelan Robots which can be very very nasty against just about everything.

I could drop 2 arc rifles and upgrade one unit of breachers to destroyers and then get another unit of destroyers, that would leave me with 110 points - with them I could grab 2 Dragoons with phosphor guns and lances.

I know it is not really a reason against Kastellans, but I have 2 problem with them - useless (in my opinion) techpriest tax, and them being really ugly models (again, only my opinion).

Grav destroyers are always always better than breachers.

Tech priest tanks wounds with 2+ armor and you should buy him the 4++ field. Also power fist. He compliments the robots well. But you're right the models are kinda silly. Wargamesexclusive makes alternate heads that help a lot. Anyway they don't compliment the rest of your army: you've plenty of shooting already.

The obvious answer to add to this army is Dragoons. They offer mobility and melee hitting power.

I like those ideas above: bunker, Inquisitor, maybe Culexus or Coteaz. Also consider Sisters of Silence. But I think Dragoons are the most appropriate.