Mtg Vampire Deck help?

I wonder if Cabal Coffers can do as much in your deck replacing 1 or two of the Crypt of Agadeem. I have one in my casual vampire deck that seems to be pretty useful. I'd probably go 2 and 2 on those... but then again I've never really been one to do a lot of 4-ofs, in my casual games I like a lot of variability.