What should I bring in a 2500 pt game knowing he's going to take librarian+null zone in a land raider and several vindicator/whirlwind cannons? I have 2 grinders, 2 princes, 2 thirsters, 8 bloodcrushers, 40 bloodletters, 20 horrors and changeling, 40 daemonettes, 12 flamers, 10 seekers to use.

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rawr. fear me.

i wouldnt worry about the librarian to much just swarm his unit with those bloodcrushers they still get a 3+ armor or just boon him. For troops take bloodletters as i find horrors not very effective against marine armies and take flamers to clean house they even glance land raider armor on a 4+. i also would take princes and the bloodthirster for some extra anti-tank and princes with boon and breath.

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Chaos Space Marines 3500+
Chaos Daemons 4000+
High Elves 2000

Get plauge bearers!!!!!! They are awesome and ar the bread and butter of most daemon armies.

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Plague for the plague lord!!!
Buboes, phlegm, blood and guts! Boils, bogeys, rot and pus! Blisters, fevers, weeping sores! From your wounds the fester pours.
4000 points of mono nurgle