A defensive eldar army? Geez idk. I would say probably Bladestorm, Defend, Power weapon w/shimmershield. That way your could shoot, shoot, double tap when they get close, and still be able to hold on in close combat. Kind of a take all set up.
I personally go for a cheaper set up that gets a GREAT amount of shots, and is amaizng with supported by a farseer. I use Bladestorm and Duel catapults.
Both of these have 10 men in the squad.
Hope this helps.