as far as the blood side of your talents, looks pretty decent, i would drop blade barrier to pick up butchery though. Also, unless you plan on grouping a lot, blood aura is a bit of a waste, since it's just turning blood presence into an aura that affects your group. I would pick up bloody vengeance also, 9% damage is a decent boost adn it's up nearly all the time I've found. aside from that it's all about taste. I personally found i wasn't using rune tap all that much so I switched those 4 talents, along with my vampiric blood talent point, over to sudden doom, and I haven't looked back since.
The rest of your talents look good, i admit i have limited experience with the unholy tree, I only went down to epidemic and got annihilation from the frost tree, since i found myself using obliterate with relative frequency. Plus the added crit% for special abilities is nice. Hope this helps, and good luck.