Which talent is best for a pvp rogue?

Rogues are DPS - Damage per second, class - in PVE (player versus environment) you want control over the mob and the ability to run away if things go badly. In PVP, everything is always going badly so you can't run away. but you can outlast and outdamage your opponent, so the idea is to setup crit and instant high damage attacks (nothing "over time" or DOTs) - pump and dump. Combat is a good spec, but there is no ONE talent that is only for PVP. The most useful on I've seen is Cheap Shot. It disables a mob, it does damage and allows you to get behind them to do extra damage: Stun Lock FTW!