So yeah I ran some sims to confirm my theorycrafting.

1) A GoD build pulls level with the standard reaping rotation for single target damage only in the very best of gear.

2) Twisting your diseases is worth around 100 dps to a reaping build. It is also possibly to do it with a non-reaping build, but you have harder timing issues. In general the timing is more crucial than that of the GoD build, as you need to hit your diseases within half a second. (Normal diseases get 90% of the ticks of GoD diseases, twisted diseases get 97.5%) If you have a second DK in the raid you're likely to still have RoR on most of the BP ticks)

3) All the numbers are surprising dependent on latency and the exact sequence of events. I'm not sure the simulator is a good model of what happens in the real world.

4) As mentioned in the previous post there can be a lot of free RP going around allowing you to eat up what free GCDs you have.

ETA:
WRT hit rating and BiS gear. With the way the stat bonuses work, socketing a str-crit gem in a yellow socket to get a +4 or +6 strength bonus is an upgrade even if you were hit capped, in our BiS gear we have many good yellow gem sockets. As hit rating is considered the best stat as long as you are under the cap it makes sense to swap some of those gems for a str-hit gem. Coupled with the available hit enchants it's quite easy to reach the hit cap even if the base gear is low in hit. Expertise kind of works in the reverse way, as when you're socketing for expertise you're giving up some strength.

In that sense when I'm putting together a set of gear, I pretty much decide on what caps I want to reach, and weight the capable stats at whatever the best stat that shares the same base gem colour with it is worth.

As for orc vs Undead: in decent (early ICC) gear your ghoul alone will do more than 1K dps, and your pets around 1.5K dps total. Blood fury averages out at about 40 AP. And the expertise is worth about 40 rating. So the pet bonus is worth about 75 dps, blood fury about 25 dps and the expertise about 50 dps if you can use it optimally. Whether that's worth the money to change over is up to you.

SS does not seem to have any extra scaling from the vampire buff at all. Several logs show both parts doing the same damage.

I can confirm that, got same result in my gear and also with T10.251 and T10.264 templates.

I also noticed that non-reaping build did same (or more) dps than reaping one until BiS. Sim bug? Using 1.2.0.5, Unholy priority, no intro.

Maybe the sims haven't incorporated the changes to bryntroll yet. Other than that I have no idea.

Also Bornakk made a comment earlier this week about a nerf to all PPM mechanics, especially melee trinkets and weaponprocs like Fallen Crusader. Anyone know exactly what changed ?
Source

You have to factor in Boomkins and SPs give 3% chance to hit to raids when speced correctly. This is pretty big and all raids should have at least one of them.

Well as far as orcs go, Blood Fury is a nice little dps increase especially when popped with other things, such as BL, Haste Pots, Garg, etc...

The +5 expertise is pretty big when you consider you are now looking at only needing 21 expertise (173 expertise rating). Thats a savings of 42 expertise rating... *correct me if my numbers are wrong*

The ghoul issue. My ghoul does an average of 1k dps on boss' he's allowed to sit on and just beat up. So taking a 5% increase is pretty damn good. Thats a extra 50DPS + considering other procs buffs ect.. that might be going around.

Over all Orcs > All DPS wise, you gain so much more overall that it makes Orcs that much better then the rest of the classes.

I think you've answered your own question there. If it was double dipping they'd hotfix it pretty damn quick once unholy DKs were doing 20% (or whatever) more damage than everyone else as a vampire. I think they've probably seen enough SS scaling issues to be able to preempt one as obvious as that.

I can confirm this as well. In 10-man my biggest phys-portion crit was 16.7k with the largest shadow portion being 18k. Really not a big deal in the grand scheme of things, but I can't say I wasn't a little disappointed considering the design of the ability was officially stated to intentionally double-dip on things like that.

EDIT: Actually there's already a great variety of logs available from all 3 specs to peruse on WMO WMO DK Listings

Hey guys, Just not sure if my math is wrong here or this is just overlooked due to better itemized options available, but shouldn't [Vengeance of the Forsaken] be at least somewhere in that top 17 list from the OP on this thread? I am thinking this only if all of the expertise on it doesn't bring you over the soft cap, which is the same premise the hit based trinkets are listed.

Thanks.

No. Exp is not needed that badly and the use effect takes too long to stack with a 2h weapon.

I think this is something that gets overlooked too often. I've been playing around with rawr & finding that I can minimize wasted item points on hit over cap by dropping a piece of hit gear & gemming for hit. Gaining hit 10-20 rating at a time will allow you to get a lot closer to the cap without going over than trying to get capped using gear with 50+ hit per item. This will also allow you to grab a socket bonus or two that you may otherwise skip. All that combined with the added benefit of being more flexible in what gear you can use make gemming hit an attractive option. I generally hear about gemming hit being a "bad" thing to do, but unless I'm missing something, I'm pretty sure it's a more efficient way to go about getting capped.

I was using an Unholy rotation rather than priority, but glad to see this confirmed. There's a difference in the way the various Sims are actually modeling things, certainly the Bryntroll proc.

In my current gear:
Using Kahorie's 1.2.0.5: Bryntroll > Shadow's Edge by and Non-Reaping > Reaping (Bryntroll proc ~5% total damage)

Using Team Robot Sim: Shadow's Edge > Bryntroll and Reaping > Non-Reaping (Bryntroll proc ~3% total damage)