Farming build
It depends on what/where you are looking to farm. I use a 0/0/30/30/10 build with staff for farming orr events. If you are looking to farm Southsun Cove, you probably want something different.
i would like to farm mainly across cursed shore, maybe with a full magic find armor.
suggest using guanglai kangyi’s build: http://www.guildwars2guru.com/topic/79899-the-ultimate-guardian-build/page__st__210
massive damage, spam VoJ between mobs for blinds.
I personally would consider dropping the points in valor for 10 in virtues and picking up Unscathed Contender; the amount of blinds you can spam with sword/focus and careful dodges should allow you to kill mobs without taking a hit (and without losing your aegis) making farming even faster.