Prot for pvp, you'd want to stack block value.
That makes Shield of Righteousness a rather nasty power.

I'd probably go a Holy/Prot hybrid, mixture of SP/Sta gear.
Glyph a little differently. Avenger's Shield glyph would be good in pvp.
You'd have pretty decent melee, and strong efficient heals.
Divine Plea up most of the fight, and stay in melee.