Here's my red/black vampire deck:
http://deckbox.org/sets/267198
I had wrestled with the idea of the exterminator. I wasn't able to convince myself that it would be handy to cast late in the game, and I didn't want to give it 3-4 slots to try and get one into play early.
I've discovered by accident that the Blood Artist/Killing Wave makes for a great combo. It creates a scenario where your opponent is losing life no matter what, and has to figure out what is worth keeping.
It looks like you've kept the deck at a great price point, which I totally respect. It wouldn't take much to bring yours back to standard format, if that's appealing to you.