Can you provide some information on your barb build? I'm in Act I hell right now, but interested in how you're playing, and what items (or stats) you're preferring.
http://us.battle.net/d3/en/calculator/barbarian#WgYV.k!bVe!ZbZc.c
Levelling was a little different, I used Cleave quite a lot and played with different AoE abilities but it's a matter of preference. That build is what I've used almost the entire time in Inferno though.
The blank skill I'm still debating over. Personally I love Overpower with the healing rune (second Revenge practically), but it simply isn't active often enough for me currently as I have no crit. I've been toying with Rend in that slot with the healing rune which has been ok, I might try Furious Charge with Dreadnought attached to it at some point.
Frenzy I should probably update the rune for, I've just kind of had Triumph out of habit, but it does help me out every now and then. Sidearm or Maniac are probably better choices.
Essentially I like a lot of self-healing and playing tanky. I'm not sure if I'll be able to make it all the way through A3/A4 Inferno like that, but I'll have to see how they compare to A2 first.
"Real" gear I have about 60k health, just under 10k armor, 500-600 each resist (with shout) and around 18k DPS with a 1h and shield. I think pushing resists a bit higher and getting a good shield will be a noticeable difference (I've been combing the AH like mad for a Sacred Shield with a high block % and resists/stats but they are exceedingly hard to find, I also check Stormshields)
"Farm" gear (MF for A1 essentially) I have about 52k health, about the same armor, 300-400 resists, about 15k DPS and 150 MF base. But I was also able to farm there with substantially worse gear, first butcher kill was with 8k-9k DPS.
For solo play, I really like the Enchantress as well. I've got her stacked with vit and MF (gives me something like 13-14% I think) and use her for the ASPD and +armor passive abilities. Her CC goes out randomly but usually helps a little bit.