Eldar were my very first army and I'm thinking of returning to my roots for
40K.
1. I like the idea of a Dire Avenger "Swarm" Army (i.e. as many as I can get for the points) with the odd Wave Serpent for fast deployment

Any good?
2. With anti-infantry fire power more than taken care of, I would support them with the other Aspects for specialised jobs, but won't have a lot of points left over. What's a good unit size for Scorpions

, Banshees

, Dragons

, Spiders

and Hawks

?