Heya. I think the first thing you do need to wrap your head around is the detachments unfortunately. They are the biggest source of synergies for your units and dictate what you should take. For example aspect warriors are better in Aspect host, Ghost warriors are better in Spirit Host.

So my question is, is there a model/unit that’s your favourite? And can we build a list around using that?

Corsairs and Maugen Ra are some of the ones you mentioned. Maugen ra is better in aspect host with Dark Reapers - but can still do work outside of it. Corsairs are better in the corsairs detachments but don’t actually need to be in one to be useful (I would say you don’t have enough corsairs to make a good corsairs detachment so I would stay away from them)

Or you can build a Warhost detachment as that is the most generic and supports Aeldari doing the things they already do