I prefer the first one overall but think something like this would perform a bit better:
Leaders
Bloodmaster, Herald of Khorne
Role:Leader Quantity: 1
Bloodthirster of Insensate Rage
Role:Leader, Behemoth Quantity: 1
Bloodthirster of Insensate Rage
Role:Leader, Behemoth Quantity: 1
Wrath of Khorne Bloodthirster
Role:Leader, Behemoth Quantity: 1
Battlelines
Bloodletters
Role:Battleline Quantity: 30
Bloodletters
Role:Battleline Quantity: 30
Bloodletters
Role:Battleline Quantity: 30
Batallions
Council of Blood
Murderhost
Total 2,000pts
0pts Reinforcement Points
Murderhost gives better mobility and having 3 units of 30 bloodletters means you will be a lot more likely to get a crap ton of mortal wounds - but then again maybe you aren't a fan of 90 of the same model in your army