So far 18 lands has been good to me. I've been able to get a solid 4 mana each time for me to play Grave Pact. After that it's all gravy. As for the other vamps: Gatekeeper of malakir is great but too limited. A one shot sacrifice and only if it was kicked, and then the only thing it is useful for is to build up, but has no benefit to it once it's played. kalastria highborn is interesting. She would work out with my bloodline keeper, but not with ulamog or reassembling skellies which are my main sacrificial creatures. Bloodghast would be great except for the 18 mana in my deck. With 24, yes I can see this card being great, but since I have such low mana in my deck, he wouldn't be helpful.As for Vampire Nocturnus, I haven't seen that one. Is the +2/+1 flying worth everyone looking at your next card?
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Ever thought about putting in Tamiyo, the Moon Sage instead of Chandra. If you get her emblem out, you can cast all of your spells multiple times in one turn... given your mana availability. Especially since you have a wide range of instants and sorceries. Only problem is that she is an expensive card.