Okay, another Rawr post. I know Rawr isn't as accurate as the simulator, but from my testing and your comments it only seems rough in a few places and let's face it: Rawr is easier for noobs like me to use.

I editted V. Heart in Rawr so it has the current PTR nerfed value.
These tests are all done in my current gear (you can armory me, highlights are Death's Bite(FC)+Awareness) except where stated, and I've been buffed with Horn of Winter, Imp. Mark of the Wild, Imp. Icy Talons, B. Kings. I've only got roughly 9% ArP as of writing this.
The reason I did these tests specifically was because I am a huge fan of Unholy Presence, and going back to a 1.5sec GCD makes me feel a little sad. Also, I believe Blizzard has always wanted us to use all of our diseases, and only wants us to DW in a deep Frost build, so I'm not looking at other alternatives here. I'm basically trying to zero in on how my playstyle is going to change come-3.2.
Live Unholy Presence + Awareness (estimate of my current state)
3.1 mode, standard
17/51/3 build
2 diseases, 20sec, 1xIT, 1xPS, 1xHB, 4xOB, 2xBS, autoFS
Death's Bite (
FC)
3121 DPS
3.2 Unholy Presence + Awareness (best 3.2 option for me)
3.2 mode with ToT,
0/53/18 build (full KM+BCB, no UA/DC)
2 diseases, 20sec, 1xIT, 1xPS, 1xHB, 4xOB, 2xBS, autoFS
2x Razorscale Talons
RI+RI = 4773 DPS
FC+RI =
4774 DPS
FC+FC =
4783 DPS
3.2 Blood Presence + Awareness
3.2 mode with ToT,
0/53/18 build (full KM+BCB, no UA/DC)
2 diseases, 20sec, 1xIT, 1xPS, 0.5xHB, 4xOB, 2xBS, autoFS
2x Razorscale Talons
RI+RI =
4468 DPS
FC+RI =
4472 DPS
FC+FC =
4482 DPS
Now, obviously there's no priority system in place in Rawr, so I can't tell it that I'm saving Rime procs for Howling Blasts or Frost Strike or anything. And those Blood Presence numbers are off, as I've seen the simulator outputs and believe the math that shows Blood Presence generally beating Unholy Presence by a few percent.
I checked using Razorice with Cinderglacier, and it was always 150-200 DPS lower than the next best option.
I compared the 0/53/18 build with a few variations on builds with a Blood sub-spec, but they were always 100-150 DPS lower.
I compared V. Heart to Awareness, and it was always 50-100 DPS lower, but obviously favoured enchants including Razorice. It will definitely be worth re-running just these numbers once Rawr knows that Razorice is a 10% buff to Frost instead of just 5%.
Anyway, according to Rawr I have a decent buff coming which is nice. I'd say most of that is from the massive leap from a Naxx10 weapon to 2x Ulduar10 ones. Incidentally, if I switch to these weapons and a BCB build right now, I'll only lose roughly 150 DPS. :P I think I just might do this and see how I go.