I started collecting these at the end of last year, with an aim to hit 1500 points.
Robots, crawlers and assault dragoons are all auto includes.
I'm still working out Ruststalkers vs Infiltrators but given the infiltrators power weapons and pistols, I'm leaning towards them.
Rangers with Arc rifles and omnispex. These keep the point costs down while still giving them some teeth. Some people use them just for the sniper option but at 74 points, you may as well just take a vindicare assassin.
Vanguard for me are not very useful, shot range low strength no AP weapons.. the special rule to reduce T is only useful in CC, at that stage they are being slaughtered. There is a fair amount of T6 spam in my area so, they are not a great option for me.
Breachers/Destroyers.. these read like an awesome unit, however, reapers shred them. Destroyers with Heavy Grav-Cannons are super dangerous to infantry, I would consider these for a Deep strike nuke, but its a lot of points and you can't send them after Dark Reapers thanks to the counter deep strike stratagem CWE have. If you have tooled the army so you can get a good chance of going first then you can use the hide stratagem instead of deep striking.
Kastelan Robots.. that -1 tohit beyond 12' hurts these guys, the datasmith +Aegis protocol keeps them alive long enough to close the gap. An option for a DS nuke though.
Dunecrawlers these have to be taken in multiples, a single one just gets smashed.
Icarus array is just OK, you kind of need two arrays to really be useful especially since a lot of armies are taking -1 to hit at more than 12". Since their bonus is based on the fly keyword they are surprising useful in my area.
I have not tinkered with the priests, they are in a weird spot for me, their invul save is not much better than Ruststalkers or Infiltrators, both of which offer more Wounds on the table for the same point cost also their armour save is handy and they have a better move stat. Since they do not have a transport option, all of these CC unit are counter assault units for me. Fulgurite's do sound kind of awesome though.
Canticles... not a fan of how this works, especially considering how most of them are such a small bonus. I've found rolling to be mostly useless since only 1 of them is ever really going to be useful in a given round, might just be better off picking so you actually get something useful when you need it.