The extra attack power reduction on demo shout is helpful, and peircing howl has great utility in pvp and pve. I'd also think about the 2 pts in inproved taunt, as the further you go in raiding instances, the less useful that is.
Styleen's is nice. It's not as good a tanking trinket as those three.
Maybe you should learn a thing or three from me. :V
5% block is pretty fucking stupid when you're spamming shield block because you have infinite rage anyhow. Your defense in pro gear is typically over 425, and you have plenty of room to spare in that respect. You should have already dropped golden hive for elementium threaded if that's your bag and this is the case. And after that, dropping Styleen's for any of those trinkets, with lifegiving or one of the other two remaining, is a really good idea since losing 24 block isn't really worth it when a boss two shots you. The burst mitigation is much nicer.
I like where your head's at wub but the sad fact is that if you rely on the random number generator too long in this game, it will let you down. Armor and +block are the two consistancies that the stupid system can't fuck with so load them up if you can. Styleen's is not all hype, and im not even close to 425 defense with the trinkets you're listing, and im 5/8 wrath. :-/
I personally rejoiced when i got my styleen's because it's the raiding tank's equivelent to ToEP for arcane power mages.
edit: not in the sense that its a timer, but the overall addition to your character's potential (atleast seemingly) goes up in a similar fashion.
It's not about relying on random number generators. It's about the fact that once you do pass 425 defense, it's more useful to have burst mitigation than shield block percentange and value in your trinket slot. Which is another reason Anticipation is so valuable.