Vampire counts seem to be a little expensive to field, I'm not sure if thats a problem for you or not, 15pound for 10 skeletons (apparently points being reduced in the new book) 20pound for 20 zombies and if you plan on playing in the
GW they won't allow any substitutes.
That said
VC is an amazingly forgiving army giving the ability to ressurect entire units. (again adding to the cost, you often finish the game with more troops then you started with) but its hard to say until the new book comes out.
It really depends on what kind of style you go to play, to me taking
vc would be a learning curve, since I played back when a full unit of 40 zombies with command would never/rarely lose combat auto cause the enemy to flee on account of its what fear did and then be able to chase the enemy down at only a -1 modifier. Not anymore