One could argue Improved Mind Blast would be a better thing to spec for, but you can only get the Replenishment from Vampiric Touch when you use Mind Blast, so it's better to not spec for it and let Replenishment tick down and restore mana than have it.
MB is your hardest hitting spell, and you should be casting it every time you can, it's a pretty stupid move to not get 5/5 imp. MB
Pain and Suffering may also raise some eyebrows, since you may think "why would I want that, it won't do SW:P's damage!" Well you very wrong person, You should only be using Mind Flay once per rotation then using Mind Sear or reapplying DOTs, so it just saves you mana on recasting SW:P.
And you forget a very important point, if you use your trinkets at the beginning of the fight, your SW:P will be with increased damage for the whole fight, which can mean a lot more damage on long bosses.
Improved VE is too much of a threat-spiker, so don't get that.
Tanks have it much easier with threat now, so you shouldn't have to worry with that. In fact, you shouldn't even have to bother to take Shadow Affinity. While I agree imp. VE is not the best talent out there, it can be quite nice for Sapphiron. With it, I can stay in my normal gear and not ever need heals.
, and Inner Focus will help you out with an occasional freebie damage spell with a 25% chance to spike that should always be spent on Mind Blasts.
Or on SW:P, considering it can now crit, and that you can keep that 25% +crit for the whole fight?
In closing, don't be afraid to use Shadow Word: Death every so often. Yes, the return damage is bad, but throw on Power Word: Shield to mitigate it and you should be fine between that, the fact you're not going to be hit as often in a group setting as you would during solo play, and the fact that heals are going to be flying around like baseballs at Wrigley Field.
No, actually be afraid of using SW:D, it's bad, a waste of a GCD, or even worse, of 2 GCD if you do PW:S yourself with it.
Glyphing Fade is essentially a "but I might need it later" move since between damage and some healing you're going to be getting aggro faster than other damagers (mages, rogues, hunters, etc.), so using Fade should mitigate that and glyphing it for a reduced mana cost means it's not as big a deal as it would be.
As I said earlier, tanks have it way easier on aggro.
I thought it'd be a no-brainer that the 3 major glyphs would be SW:P, shadow and MF.