I'm with combatwombat on this one. Stacking BV gear is not the way to go with prot PVP, even though this thread is focused on the prot/holy split and not prot/ret.
http://www.wowarmory.com/character-shee ... lf&n=IgnisI'm currently running as this in BGs for the last week, can't seem to get myself convinced to arena again, but it really is the better way to go. Watch wombat's latest video on prot pvp in ret gear and it's astoundingly effective if you try it.
http://www.youtube.com/watch?v=KN0h0ZO1loE (sorry wombat, I love your video, but the music selection doesn't fit

)
This is going to be especially true if the current build of the PTR goes live as is, SBV is going to be soft-capped for ShoR. Which is also the only attack that benefits from that value, everything else takes from a combination of AP and SP. So stacking STR to get your SBV in this regard is much more effective than stacking the BV stat.
BTW, I love running around as prot. I was my guild's MT for all of BC, this wasn't always a good thing, but since we ended up with a surplus of tanks in WotLK I switched to ret to shore up our failing DPS. I can definitely say I'm glad to be back playing a prot, even though I'm not tanking anything right now except maybe a few WMs and Drek in AV or half of the horde's team in WSG when FCing.