Dark Elder advice needed.

[Gareth]

In the interest of fairness, to all game systems, before I slate 40k, I really should try 6th. That and the fact I have a fair amount of stuff, sat waiting to be assembled and painted, across many systems (40k, WFB, Relics, Dark Age, SAGA, FoW and probably others,) I am looking to clear some of the back log.

So I am looking at starting to assemble my Dark Elder. Now I have had a handfull of games in 4th, two 500 point in 6th, but the majority of my experience has come in 2nd-4th.

So what little tidbits of advice can folks give me, when it comes to force assembly. I'm not after, "In a DE army take X and Y," but more generic importances across all forces, which then help me build a force.

Example being would CCW and Pistol be better than a Rapid Fire weapon, even in a non-assault unit?
Does every unit require an Armour (Tank/Dread) damaging weapon?
With changes to Power Weapons, are they as effective, or are they now a waste of points.

Thanks in advance,
G.