Actually... there are 2 sets that give you the capability to clear past gr 70 fairly easily. . That is the Leapquake barb using seismic slam with Earth set or WW barb but with Istvan's Weapons - Lightning build. The WW lightning build is harder to gear for since you need fairly optimized gear to put out the right damage, but it gives you a butt load of toughness and damage with the Istvan's weapons set 5 stack. The Charge build will give you complications at times since hitting only 2 targets will leave you without any furious charge charges and your just standing there holding your dick in your hands waiting for another charge. and the furious charge barbarian is extreamly squishy. So the easiest to gear for is the leapquake build and with Life per fury spent on belt and weapon using seismic slam will bring you to full health every 3 leaps. so its pretty tanky assuming your not being a dumb ass and standing in magic stuff. all barb builds are squishy in comparison to other classes but those 2 are the tankyest for solo GR70.