Sorry for this massively late response:
Raider rush is good but make sure you are balanced. I recently ran 20 warriors in 2 raiders with splinter racks accompanied by a raider with Archon with Wyches in and 3 venoms with extra cannon each filled with 5 wyches with hyawire grenades. This list- as expected did incredibly well and 1500 points of Dark Eldar killed off 2500 points of Daemons and Tyranids with little trouble.
For the Archon- depends on what you are playing: Here are some classic and fun builds for you to experiment with:
The Death Star:
Archon
Huskblade
Soul trap
Shadowfield
Combat Drugs
Phantasm Grenade Launcher
The bane of Tyranids
Archon
Venomblade
Shadowfield
Phantasm Grenade Launcher
The Tactician
Archon
Agoniser
Webway portal
Clone field
Phantasm Grenade Launcher
Ghost plate armor
Experiment and good luck- also both are useful to have a retinue of either incubi or wyches