I think you're just trying to do this for fun, right? Not looking for any specific advice... just wanting to see people's opinions of the best ret build/gear you can have.
PvP:
Mine would be all PvP/Arena gear, with mostly Guadion's build posted (sorry mate, I gotta go with Vengeance... 15% damage almost constantly is too much to pass up, looking the build over, I'd probably take the points out of Fanatacism. Don't care about threat since it's PvP, and 15% chance to crit with SoC is alright... but I don't plan on judging constantly, so I wouldnt get as much use out of this as I would Vengeance, assuming I can crit at least once every 30 seconds... and if I can't I would need to be taken out back and shot)
Weapon... stormherald. Extra stunning is nice, and I have access to it so I will use it. Trinket... PvP trinket, and the battlemaster one. Libram.. the one that gives me resil when I judge.
I'll get all that, then I gotta work on getting 0.5 seconds faster to be in the awesome ret category.