You can also use "flat absorb" (think it's called this) to reduce the damage you take even further...Gladiator's Bane has some, and others probably too... but I can't remember any more right now. Sol rune socketed in armor/helm also gives damage reduced by 7.
Oh, someone remembers my little guide. Feeling proud . I made a barbarian on almost the same concept recently. But I invested in vitality and became practically immortal. Sadly he was a conc. barb ---> boring as hell. Quite cool to be immortal though.