The way i see it is, if DW tanks are viable, then 2 handed tanks with BCB isn't an issue.

My rotations is relatively simple and much like the one posted here on EJ, if not the exact rotation. The only thing different is that I do not use DnD on single targets at all. I find that breaking my rotation for an DnD is not worth it, imo.

IT-PS-BS-BS-SS_Runic Dump
SS-SS-SS-Runic Dump

The weapon I choose is because of the top end on it, and the fact that I haven't gotten ID yet.

I thought we dubbed BCB a bad talent for tanks near the beginning of this thread, since the talent hasn't changed I don't see why that would change.

This is more for the end game DK's fully geared but :

At what point should I switch from getting avoidance to threat generation, or am I pretty much topped off?

Right now I sit around 60-70% not getting hit by a boss. (Last night Patchwerk 75% of hatefulls never landed with 74% mitigation)
My threat generation is around 5k tps. (Give or take but average 25man tps in Maly/Naxx/Sarth)

Is that all I should expect? Or is there more for me to improve on?

Personally I have a feeling the only way I can alter the numbers would be switching my spec to Unholy or Blood. From reading these forums I get the feeling that with my gear level being as high as it is I could go probably drop some of the frost talents in favor of threat generating ones.

You generally switch from avoidance to threat generation when your DPS pull off you or get close. I generate as much if not more TPS as you in a 10man, which isn't good. I would say get rid of your parry/defense gem, all your defense gems, and repelling charge. I would then gem for either 8hit/12stam or 8exp/12stam, preferably 8exp/12stam until the soft-cap of 26. I also don't see why you have ice walker, 16agi to cloak, 20hit to gloves, and no arcanum. I'd get the essence of gossamer from H AN to replace the charge.

EDIT- If your DPS isn't even close to pulling off you then just put in 8dodge/12stam gems or 24stam gems for the most EH and/or avoidance.

That is a pretty weak argument against the talent. By that logic you should be looking for only 3.8 speed weapons because a 3.4 speed weapon will hit more often and cause a greater chance for a parry.

BCB adds additional TPS which is needed in an unholy build.

You can get away with BCB if you like, but if you're depending on it for threat then parryhasting is the least of your concerns. Lots of tanks outgear the possible consequences of grabbing BcB and probably would not notice any negative effects.

I plan on being on the competitive edge for Ulduar, and I don't consider BcB a necessary risk in terms of min/maxing for new content.

Yes, I'm saying that the 2% threat/10 parry to gloves is better.

I would personally use the Gossamer over the Charge just because I find that there isn't any reason to have more then 540 defense. I also don't find 3k HP for 15 seconds on a 3 minute CD to out-weight ~1.1k constant HP. I don't think that any of this current content besides Sarth 3D require any real min/maxing in the survivability section of tanking if you just gear yourself properly before jumping into the content so if you prefer the Charge then I'd use it but I still recommend using your sockets for threat or EH instead of defense.

Yeah I have a whole assortment of gear from the Heroic 5-Dungeons.

I like the cool down only because I use a macro for Pot / Cooldown / HerbSkill , its my ultimate I am gonna die button. It buys me that .5 second I need sometimes, often I find healers get used to me not getting hit. I wish they would make an epic version of that trinket. I would be all over it if they did.

I will have the badge bracers soon as Military / Mob drops have not provided me with any upgrades for my bracers those will get enchanted as soon as I get em.

I will be enchanting my gloves with the threat enchant today.

I have spent the last week absorbing all this WONDERFUL information! Thank you all who did the number crunching! That being said, I shall continue to the point. . I have rolled frost since before the patch, and enjoy it alot. My rotation is usually: Single target, IT-PS-BS-BS-OB Multi, (usually drop DnD and DG them to it, so runes are otw to refreshing) IT-Pest-HB-PS-Pest for snap AoE (if theres an arcane mage or two I toss deathchill on it). The cd removal on pestilence allows (in multi mob situations) for no more need to cast IT or PS, thusly I OB on the dps target and HB whenever possible. I also have RS macroed to all my attacks (accept DnD and FS). This is a bad choice in the eyes of some, citing that leaves little RP for things like IBF and AMS. With my spec I don't have RP issues. Since I PUG all my raids, I never know if there is going to be a shaman to drop windfury or not, so I took the Icy Talons batch. I have played without it and can see the difference in damage I take because of the attack speed debuff. My concern and reason for this post is, with all these benefits of frost, why would someone take unholy or blood? I have no threat issues either single target or multiple. I realize that this is a game, you should have fun, and DK's were designed to tank in any tree, but it just seems like an easy choice. Once again, thank you all for taking the time that I don't have to theorycraft.

Personally I have tried over 15 specs starting with Unholy (Pre-Patch 3.0.8). All of them are effective at tanking. Key word is effective - by that I mean viable. Most raids have 2-3 tanks so filling that role can be different on different fights.

Unholy seems the best for buffing raids with valuable (Increased movement is worth its weight in gold imo) buffs. It has an increased effect on multiple mobs and one AoE pulls its can put out incredible damage.
Unholy seems to favor casters with its buffs (+13% Magic damage)
Second highest health buffs

Blood seems the best for single target and has highest health of the 3 specs. Also provides valuable buffs to melee that stack with other similar buffs. Highest expertise through talents. Very good survivability.

All the trees have their high points and low points. Its a matter of play style and personal opinion. Any good player can make any spec work(To that end I mean barring gear/computer/lag/broken arms).

Please this post is a general statement if I left anything out its not to favor any one tank spec over another.

Hope that helped with perspective.