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I don't know a durn thing about Dark Eldar, but I highly recommend checking out the 1d4chan tactics review of their army. They give you a description of every single model and upgrade you can take as well as some basic tactics. As an added bonus, they are really funny (assuming you aren't offended by wildly innappropriate humor).
http://1d4chan.org/wiki/Warhammer_40,000/6th_Edition_Tactics/Dark_Eldar