Rogue is definitely the best for Farming. Quick kills and fast hits take a mob down lickity split lol
Boggans are good for farming, and not too difficult if you have a good build and gear.
What skills would be best for killing them quickly? What lvl should I get to so that they can still target me (riptose) and I don't completely get pummeled?
Personally I used shadowstrike, riposte, quickstrike, lifesteal, poison weapon, and dumped extra points into fast reflexes. I chose lifesteal over dbl attack because it saved me from having to use restos and I favoured dex over str in my build anyway. Dbl attack is a great skill though if you have a str>dex build with a decent amount of melee dmg since your attack can't be evaded.