Take KDs adviceI'm experienced when it comes to taking on the Dark Eldar, so I'll offer you what I know.
Just get them walking as soon as possible.
I try to target the transports, hoping they entangle etc & lose bods in the crash (all to change in 5th Ed (allegedly!)).
Then target the closest units, FoF is still dangerous to tie your units up until the hard-hitters arrive (+ block LOS etc).
Target priority for me (squads) would be: Wyches (nasty,nasty,nasty!), HQ then remaining troops.
Concentrate systematically until they are cleared.
Ignor all else until you blunt the lightning assault, unless the talos(') is/are getting into charge range that is.
Their static firebase and Ravager(s) will be hurting you, but you hope to weather them until you can free up & send your counter-assault units after them.
Never underestimate a good DE player