You use 2x DS per 20 second rotation (= +630 damage)
You have RP for 2-3 DC per 20 second + ~1 DC sudden doom proccs (= +760-1520 damage)
Now i'm not sure how the talents and other modifier affect those sigils, but i don't think it's possible that Awarenes can surpass VH in any way.
Well, you are correct. I went ahead and picked up the sigil, and my dps did go up by a decent amount. In addition my recount breakdown now looks like zuubtastic's parses, so that makes me feel better about my rotation and damage.