Consider getting a Polished Granite Tomahawk. It'll let you solo to 20 with relative ease, possibly even further with that kind of twink gear. The proc is also decent aggro and, more importantly, is an AoE aggro gainer that doesn't break mezz or aggro neutral mobs. I find myself using it occasionally even after getting better weapons; the absorb shield is decent enough in a pinch where a difference of a few hundred health could save you, and if you're tanking one mob while three others are mezzed on top, a handful of berserker procs is about the equivalent of proccing a yak twice on each mob.
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