OK, so I've made a list that I think have some punch to it, with a lot of versatility and plenty of tactical potential with 18CP, recycling and fate reading. I will try this list against all-comers to see if it works or not, I just need to add a few of the models to my collection.
Biel-Tan battalion (1034p)
Asurmen 175p
Spiritseer 65p -Spirit stone of anath'lan. [Quicken/restrain]
5x Dire Avengers 64p -Exarch, 2x catapults.
5x Dire Avengers 64p -Exarch, 2x catapults.
8x Storm Guardians 56p
5x Fire Dragons 123p -Exarch, Fire pike.
5x Howling Banshees 68p -Exarch with executioner.
3x Shining Spears 95p -Exarch with starlance.
2x Wave Serpent 324p -2x Brightlance, twin catapults, spirit stones.
Ulthwé battalion (635p)
Eldrad Ulthran 150p [Doom, Will of Asuryan, Executioner]
Autarch skyrunner (Warlord: Fate reader) 112p -Banshee mask, laser lance, avenger shuriken catapult, twin shuriken catapults.
10x Guardians 97p -Shuriken Cannon.
5x Dire Avengers 60p
5x Dire Avengers 64p -Exarch, 2x catapults.
Wave Serpent 152p -2x Brightlance, twin catapults.
Alaitoc Battalion (330p)
Illic Nightspear 80p
Warlock Skyrunner 70p [Protect/Jinx]
5x Rangers 60p
5x Rangers 60p
5x Rangers 60p
1999p
The idea is to embark on the serpents like this:
Avengers + Banshees + Spiritseer
Avengers + Dragons + Asurmen
Avengers + Avengers + Eldrad
Asurmen, Eldrad & Spiritseer will embark depending on opposition, but this is the default layout.
Asurmen is not craftworld bound so can buff models from any craftworld.
The spiritseer can let the banshees move twice, and with the relic it will be as reliable as with a farseer casting it.
Eldrad can take on enemies the Avengers have trouble dealing with, which gives them a nice mix, dooming targets for shurikenfire is always nice, but is even more deadly with Biel-tan Avengers.
The Warlord will castle up between the serpents, granting them the ability to hit better with their brightlances, creating a nice symbiosis.
As for the Alaitoc detachment, they are all snipers, Illic ad the Autarch can appear anywhere, while the rangers are good objective campers and deepstrike denial, in addition hitting a little better with the Autarch nearby could net them some important characters, or simply finish off stragglers.
(If the shiftshroud is not allowed to be used to it's full potential with the new beta rules he can take foalchu's wing instead and embark on one of the serpents)
The stormies are a tax unit, but will be useful to block first turn charges against the shining spears. The defenders can OTOH be used for deepstriking as black guardians.
Changes I'm considering is to remove the Alaitoc Autarch in favor of a warlock to save points, but then I will be swapping detachments with Asurmen.
Thoughts?
Oh, I can embark Biel-tan units in Ulthwé serpents right?( or do I need to reshuffle them and lose some free spirit stones?)
Edit: Moved 2 serpents to biel-tan and swapped 5 avengers with the stormies.
Edit2: Decided to swap Asurmen and the footarch, and change relic, now that Autarch can hop out and shoot his reaper launcher while buffing the brightlances of the serpents, or simply have a threatening charge range, while denying overwatch.
Edit3: removed footarch for skylock, and swapped Asurmen to Biel-Tan. I also added default psychic powers.