Are you talking fluff or rules?
Because if rules are also included I'd immediately go for the 6th Ed. book!
(Remembers Vampire Lord with Hydra Blade, Black Amulet and Carstein ring, having to kill an insanely pricely and killey model twice for only 50 pts extra. Remembers killing such a vamp once and leaving the opponent with said vamp and 2 skellies while having more than 50% of own army still alive and LOSING on VP! *shudders*)