For PVP arena, I can't help but think that spirit of redemtion would rock, as priest are so often the first to be killed. And reading a previous post, VT isn't so beneficial in arenas.
needs more points in imp MB. take from shadow focus. shadow power > misery in pvp take holy nova. imp healing does not apply to flash heal, pom, or renew. when will you cast greater heal?
i rely more on MD & sw:death while pvping. this is how i'd run holy/shadow