So, I've been playing since vanilla and I've never really gotten into PvP (beyond screwing around back in vanilla when AV would take 4 hours and doing mindless WG/TB over the last two expansions), and I've decided I'm going to get into it a little bit, but I don't know which of my two characters to use (or if I should get one of my other ~80s up to 90 for PvP purposes).
Right now, I have a druid (feral/guardian) and a DK, both of whom have LFR weapons and a full set of the blue pvp armor. I also have hunter and shaman at 85 and paladin, mage, warlock, priest at 80. Of these options, which would you suggest for a complete pvp noob (who is going to focus mainly on random BGs for now). -- Obviously, I'm also cool with switching specs, etc.