If you are going to cheap out on an archon then I'd suggest just drop him all together and take a Haemonculus instead, at the kind of points you have in HQ the Haem provides greater utility and threat. Archon with nothing but pistol vs Haem with Liquifier, venom blades and a free Pain token to hand out, who the comes in at 10 points less!!
As for Ravager vs Warriors I'd say it depends on your meta, generally I find 3 ravagers to be over the top at 1k points. But if you think you will need it, take it!
The other thing to do might be:
853pts
Swap Archon for Haemonculus with LG and VB-10pts
Add Ravager +105pts
Drop Blasters - 45pts
Add Venom w/ 3 Wracks +95pts
Total 998 pts
EDIT: I would also drop the fourth Trueborn, he is wasted in that unit, it is very much a hit fast and hard or die before having a hand in the game type. With the points you could add a Nightshield to the third ravager
Lose: Blast Pistol, 3 Blasters
Gain: 3 Dark Lances, 2 Splinter Cannons (Venom), Another Objective Holder (Wracks, maybe even reserve them for taking objectives in your deployment zone), more vehicles gives you opponents more decisions to make, less mixing of battlefield roles (this one is taste dependant!)
ST