If I were going to spec unholy dps again, I would go something like
this.
Differences between mine and yours plus my thoughts:
Virulence- Unholy has just about more spells than any other spec. Frost also has a ton, but I still think unholy relies on spells even more than frost. Unless you're planning on getting enough hit to be spell hit capped (which some people are doing, but I wouldn't), I would pick this up. It makes a difference
Outbreak- This was a throwaway point for me so that I could get deeper in the tree. You only use blood boil on trash and you don't use PS except to get your initial disease up. Not really worth 3 full points IMO.
Gargoyle- Really good for single target dps, and let's be honest... nobody cares about trash. It's all about the damage you do on bosses. Well worth 1 point.
Reaping- This turns your blood runes into death runes, which allows you an entire extra scourge strike. This is absolutely a must-have for dps.
Desecration- I had someone tell me once that they read a report which showed desecration accounted for less than 5% damage when you're standing still (makes sense, you'd have to have a perfect 100% up time to achieve 5%), and then less than 1% on bosses you have to move on. Considering how many bosses you have to move, I don't think this is worth a 5-point investment.
Unholy Aura- If it doesn't help dps, I'm not a big fan of taking it. Unholy aura is more of a PvP thing, it is really a waste in pve. I have never had trouble getting in and out and around on bossfights.
Night of the Dead- Your ghoul can make up anywhere from 300 to 500 of your dps, keeping it alive and fighting is important. This talent was decent before it was buffed, now it is incredible, especially with the new raise dead and ghoul glyphs.
Finally, my comment on bone shield... The nerf to bone shield did not affect dps specs at all, dpsers did not take it for the mitigation anyway. DPSers take this talent point because while you have your shield up, you do 2% extra damage. That's a nice point considering while you're dpsing you can have near 100% uptime on this.