Ethereals look like they are going to be useful finally. +1 shots to pulse weapons that stacks with the +1 from Cadre Fireblades. That's a whole lot of St5 shooting.
And the Riptide. Expensive, but awesome. T6 with 5 wounds. I'll probably run it with the ion cannon and twin linked plasma rifles. Not sure if I'll add the shielded missile drones. 25 points each. I'll have to test it out.
I want to try something like this out in my first list: Cadre Fireblade, Battlesuit Commander, 1 crisis suit squad, 2 Riptides, 2 Firewarrior squads, 2 Kroot squads, 2 rail-sides squads with two suits each, Avatar, Wraithlord, and min Dire Avenger squad. Plus whatever else I can squeeze in. Probably a flyer or Pathfinders.