Jokerfiend, you may be interested in watching my new video on gearing your barbarian on the auction house
This video also shows all of my current pieces of gear for those that are interested.
youtube.com/watch?v=GutiXJOpwVg
The reason I don't have relentless is because it doesn't work if you are above 20% when you get hit. So for example, if you are at 21% of your life, say 10k, and get hit for 9k, relentless will not mitigate any of that damage. That seems risky to me, but I believe that as your max hp, resists, and armor increase, Relentless will eventually become very good, since any hit you take will be for only a tiny percentage of your max health and therefore this risk I mention is minimized. I think I may be reaching the point where that is true for me, but it may not apply to most barbarians so it's not really fitting to recommend off the bat.
I dislike life steal, either from Bloodthirst or the Ignorance is Bliss rune for Ignore Pain because in the Inferno Difficulty any lifesteal healing is reduced by 80%. I first learned of this from Kripparrian's video:
youtube.com/watch?v=33UDzGZTHPI&list=UUeBMccz-PDZf6OB4aV6a3eA
In it he explains why you should go for life on hit instead.
If you're playing with friends, I think control options such as Ground Stomp(Wrenching Smash) or Threatening Shout(Intimidate/Demoralize) become appealing. While I like Threatening Shout in general, and even used it the first time I soloed Diablo on Inferno, I feel that having the mobility of both leap and furious charge is quite nice for soloing. For example, if I farm up 5 stacks to do a boss such as Siegebreaker, I may want to skip through the cursed tower part instead of killing everything to reach Cydaea/Azmodan.
I like the concept of Wrath of the Berserker but it just doesn't work for me at the moment. My dps is pathetic at 7k so even using wrath it's not enough to burst down an enemy. When I increase my dps I'll reevaluate it Don't forget that using Furious Charge while you are jailed will break the effect, and I'd also like to share a trick I discovered to avoid being frozen:
youtube.com/watch?v=jX-0i91C-VM