quest for the gravelord is a definite must (in my opinion), and as far as gravedigger you might be better off with skinrenders and some disentombs. I dig vengeful pharaoh, im trying that out in my zombie deck as well, and its really too bad how grave titan is not a zombie (nim deathmantle helps here), that always seems to get in the way with the call to grave combo. The q for gravelords would also help offset the fact that you have to sac your reassembling skeletons with call to grave.
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I would consider adding ponder, definitely an extremely helpful one drop for a deck like this
Definitely getting another cemetary reaper or two soon, and the price of the vengeful pharaoh was just halved so i picked up two to balance the mana curve a bit. I hear you on the cutting down the zombie infestations but those really help with the call to grave winning condition, but i might try running two in games and seeing how that works out. smallpox is out for sure, and im still debating the disentombs, those come in handy with getting the skinrenders back out for another round of 3 -1/-1 counters.