Dont bother with night fight either. Unless they are really far away it dosnt pay most of the time.
Even with a reroll on acute senses, the average is only about 21'. This can still make quite a huge difference.
str 7 is nice but almost none of them have more then 1 wound.
It does ignore Feel no Pain on anything T3 though, which is very important.
Ci tian with WD would be good until you meet their poisoned weapons ...
C'tan will fall very easily to Venom Spam. Only takes statistically, two venoms to down a C'tan.
I
think scarabs and wraiths are the way to go, scarabs vs witches and wraiths for their vehicles or take out their talos ... evil models.
This one of the few armies when Wraiths wouldn't be as Ideal. Anything can take out Dark Eldar Vehicles. Sending a regular swarm of scarabs at wyches is a colossal waste.
As for fighting them, a few things.
Eldritch lances will decimate them. While you may not have that many at 1k points, these scale incredibly well. The Strength 8, 36 will blow their vehicles out of the water.
Annihilation barges, are fantastic as well. They have a shorter range, but if they hit a Dark Eldar vehicle, it's going to go down, even with the
AP-. Also, the Arc effect has a chance of downing any vehicles nearby.
CCB will wreck a Dark Eldars day as well. They are fast, and a sweep attack will just ruin anything it comes in contact with.