CBF is over-rated. Never understood why people like Raven so much, unless you need AR.
For the BIS zeal paladin etc you would also use a poison/cold sc in inventory, so the cold dmg on raven is even less points.
A dual leech ring + a good stats ring as 2nd. that is key. Dual leech helps sustain mana so you can make teleport work, which you ofc use on any pvm or pvp build. Forty is nice, but we need teleport.
You can also just use mana leech ring, if you use exile, or have leech on say your CB gloves...No, dont use draculs, or Zaka, use good CB globes and exile.