it depends on what you want out of that slot. Both reavers, beasts, and scourges off their own bonuses. Reavers are good for contesting late game, and rushing them up will draw alot of fire and kill them off quickly. I would suggest giving them blasters, and basically using them to jump out, shoot something, and jump back behind cover. You will find they survive alot longer with that in mind.
Beasts are decent, but wound allocation really hurt them imho. Other than that, they are a good counterattack force I would drop those extra kymera for more razorwings though
Scourges are good with haywire or sucicide heat lances, thats about it. Haywires are still an amazing ability though as its basically "oh did I only take 1 hull point from that tank??? yah... its dead now"
You could also use those points to ally in a jetseer w/ divination and 3 GJB. That gives you re-rolls to hit with your venoms/ravagers, and gives you a decent scoring unit to boot... is up to you really.