Define "PvP."
You are missing a lot discipline talents that I would want in a PvP priest. That is, if you wanted to do much arena.
This is one of the most popular arena builds going. In any priest that I am making for arena healing, I want Silent Resolve, Absolution, and Mental Agility. It doesn't pop-up on any post-game charts, but dispelling is a
HUGE part of a PvP priest's job (whether arena or BGs).
As for the healing build, this needs to be a bit more defined as well. Healing raid content and healing 5-man content will call for slightly different approaches. I generally would not take Imp PW:Shield. Of course, Imp PW:Fort is unnecessary if a fellow raider has it. On the other hand, you may need to spec down to Imp DS if no one else has it. I would also advocate picking up Healing Prayers; you could drop Imp PW:Shield to do this.
Naturally, this is just my $0.02, and it's coming from a shadow priest ;-) So take that for what it's worth, and let me know if you have any questions.