Get yourself a couple of Battalion boxes:
This can easily give you a solid core of Crossbowmen around which to anchor a battle-line. Alternatively, you can get yourself a rather hefty block of spears with a few small supporting crossbow units.
Corsairs with the Sea Serpent Standard are pretty awesome - they combine high numbers of attacks with relatively good survivability and are probably your best target for Mindrazor.
Cold One Knights are just pretty good all around. The models are excellent and they form a very nice centrepiece to your army. On the table, many argue that heavy cavalry are outdated. Personally, as a Dark Elf player, I'd say otherwise. In a unit of 10 with the Standard of Hag Graef they are literally killing machines. Against any unit with S4 or less, they're a solid bet to grind your opponent down with large numbers of S4 attacks that can re-roll to hit in ongoing combats.
Of course, you're going to need to add some other units. Sorceresses are key, Cauldrons of Blood are a very nice additional buff. I've gone down the route of avoiding Hydras (they're annoying to transport and people bitch and whine about how OP they are whenever you play with them). Instead I've loaded up on a solid unit of 15 Black Guard, a few small units of shades and some small units of Witch Elves. This "MSU" tactic gives plenty of versatility and manoeuvrability. However, with a book as strong as DE you can pretty much pick whatever you like and it'll be competitive.
Things to avoid though:
Small units of Executioners, Masters kitted for combat, large units of Witch Elves, Repeater Bolt Throwers.
All of those choices are simply, in my opinion, not cost efficient.