Holy PvP Advice
I think a lot of healers use addons that allow for mouse-over heals. And I'm sure some have macrod abilities/heals that will instantly target a specific player or enemy, even some that will automatically try and target anything within range.
Personally I don't like mouse-over healing. But I use a mix of it. I was a clicker for too long, so I needed to actually click someone's raid frame and then heal. I use Clique, which actually does allow mouse-over healing. But, say, for Holy Shock, I don't mouse-bind it, so I select my target and then press "2". For Divine Light, I can mouse-over my friendly and then press my mouse-bound button. It basically allows for either.
And I don't have to worry about accidentally Holy Shocking the wrong target. Whereas if I'm casting Divine Light on the wrong target, I can easily interrupt my own cast.
Actually, the main reason I use Clique is because I didn't like Vuhdo. Too comfortable with default Raid frames.
Intellect and Spirit are priority stats, and you should typically reforge into Mastery. Haste isn't very useful, since in competitive PvP every cast-time spell you try and cast is going to be interrupted and locked out from Holy.
So, in my opinion, Crit is better than Haste, although both shouldn't be gemmed or reforged.
And if you find yourself with like 10k Spirit and you're never going below 75% mana or something, you could give up some for Mastery.
Youtube's a great source for stuff. This guy has good vids http://www.youtube.com/user/GamingWithIndy/videos?view=0
But remember a lot of it's preference, and what helps you most. And that my advice should be taken with a grain of salt, as I have no first-hand experience in higher PvP.
Oh, and like I said, cast-time heals shouldn't be used much in scenarios where you'll likely be shut down.
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