I've completed Act 2 and have been gearing up for Act 3, I've made a lot of purchases but Barbarians I've seen that have cleared inferno have 15k damage, 50k+ health, 100 all resist and 9-10k armor.
My stats aren't near this but I've spent a lot of money on upgrades. I don't know what to buy or how to upgrade my gear from this point.
You obviously are building your barb right, its just a matter of farming from here on out. Late A2 gear sells for a LOT on AH, so I would exploit that and farm A2 for auctionable gear for gold, then buy really great upgrades on AH. This can be A2 goblin farming, oasis farming, etc.; whatever it takes to get that 5+ million gold per item for perfect upgrades.
Basically, more str/vit/res. At least 100 str, 125-150 vit and 65 resist from here on out. If it doesn't have that trifecta, don't bother. Need to push that resist past 1k, dps to 15k, and hp past 50k.
So that being said, here's some drunken musings I've gathered from checking out your stuff.
Helm: 69 resist is good, the str/vit/armor is bad.
Shoulders: More str/vit/armor, 100 minimum
Neck: Decent, resist all would have been better. Going to be expensive for minor upgrades.
Belt: The life on hit is low, but the other stats are great. 18% melee redux is pretty awesome. 0 vit/str though. Not sure finding a str/vit string of ears with phys/elemental resist is possible, but worth a look.
Chest: Vit/res is decent, needs more str/armor, and 60+ res would be ideal.
Gloves: More str/res, 300+ armor would be ideal
Bracers: Not bad, but low armor and vit.
Ring: That Immaculate Testimony is a PHAT ring goddamn. BUT. No vit Finding a ring with 100+ vit/str, Life on Hit, AND resist all is hard. Good luck upgrading that.
Pants: Easy upgrade. Needs strength. Plenty of high str/vit/res pants on AH. Extra affixes are icing on the cake. 400+ armor pref
Boots: More str, more resist, at least 300 armor
Shield: The res is good, that block chance is insane, but needs more vit/str/armor. You'll have to look hard, but 1100+ armor shield with good str/vit/res/block are out there. Going to cost an arm/leg.
Wep: Needs a huge upgrade. 950dps min, 1k+ pref. Life on Hit is great but hard to come by. Str/Vit are also great, but hard to come by. Could probably settle for a 1k+dps wep with IAS to pull extra Life on Hit from rings/neck.
TL:DR? I'm pretty drunk and have no idea what I'm talking about, go about your business.
You're lacking in the life on hit department, a weapon with a socket or initial life on hit could be beneficial.
Other:
a. your shield's block value is rather low, a storm shield (with high percent block chance) would be perfect.
b. your panties, any rare upgrade should provide a neat dps bump (strength) and more survivability (more vita and/or armor)
A Stormshield with similar block value is insanely expensive, I bought this shield for 200k
Basically, more str/vit/res. At least 100 str, 125-150 vit and 65 resist from here on out. If it doesn't have that trifecta, don't bother. Need to push that resist past 1k, dps to 15k, and hp past 50k.
So that being said, here's some drunken musings I've gathered from checking out your stuff.
A Stormshield with similar block value is insanely expensive, I bought this shield for 200k