I used to do a lot of pvp with my pali. Now I havnt played much, but these were my specs
this was really effective for me
Talent Calculator - World of Warcraft
I went with ret
I tried speccing holy and prot. They had their benefits, holy, I had pretty nice heals and spells, prot I couldnt die very easily, but I liked ret the best. I could do a bunch of burst damage (1k-3k) and still be hard to kill and have my heals because Im a pali.