So here is 2k of Anti-Eldar. He usually takes a wave serpent with either Wraithguard and a spiritseer or 6 Avengers, Farseer on Jetbike with 3 Warlocks on Jetbikes, 2x10 Defender Guardians (shooty ones) a Wraithlord, 2 Fire prisms, a War Walker, sometimes swooping hawks or Banshees.
Here's my 2k list to counter that.
HQ:
Succubus: VB Haywires
Troops:
2x10 Wyches: Raider, Hekatrix w/ PGL and VB, Haywires, 2x Hydras
9 Wyches: Raider, Hekatrix w/ PGL and VB, Haywires, Hydras
3x5 Kabalites: Venom w/ Nightshields and extra cannon
Elites:
3x3 Lanceborn
Fast:
9 Reavers: 3 Heat Lances, Grav-Talon, Champion w/ VB
Heavy:
2 Ravagers: Retrofire Jets
Razorwing: Splintercannon, Nightshields, Flickerfields, 2 Disintegrators
Total: 2,000 points.