Dark Eldar

What is the best elite to get for a dark eldar army I'm trying to choose between Wracks and harlequins I'm trying to make a small 1000pts force at e mo any advice?

Harley's are gr8 for painting all shades of meh in game go for the other ones more evil

Wracks are much better when you turn them into troop choices using Haemonculus'.
Harlequins are basically beasts are like twice the points cost.
It's hard to go wrong with Trueborn, probably the second most versatile unit we have.
Mandrakes are okay if you really know what you're doing with your army, they're a jack-of-all-trades.
Blood Brides are very meh now due to the changes into assault. Getting them into combat is harder, their damage has been reduces, wych weapons are less effective.
Incubi are a solid assault unit that can hit like a truck, but are quite expensive.
Grotesques are both weaker and stronger in 6th, but again, expensive.

In the 1000pts arena, I'd probably stick to troop choices and fast attacks.