What kind of build are you going for specifically? I would recommend doing as much questing as possible to make it less painful if/when you decide to transition into a zerker. Off the top of my head, some of the essential quests for 1 def pures are: RFD up to Mith gloves, death plateau, animal magnetism, horror from the deep, DT, lost city/MM (if you're getting 60 attack). There are also some easy quests you should do for early combat xp like the gnome ones, tourist trap, fight arena, etc. Knock those out of the way first then work from there.