Well, first my char : eu.battle.net/d3/en/profile/Twoflower-2131/hero/1003680
I am sitting on a few millions, but not more than 5-10 at any time. Recent upgrades were the shoulders, the boots for the two set bonus, the chest. I am sitting at 55k dps, almost 70k with battle rage. Resists are all well over 600 with war cry.
Problems I face : I can not keep up wrath. I always run out of mobs ^^ Not that I need it on MP0 xp runs, but I am working on a hellfire ring and MP4-5 gets very tough not to die. I usualy die alot to molten ( if not kiting like crazy ) and to poison if I dont pay attention.
With a budget of 5 - 10 mil, what would be my best item to go for next ? I saw that a right witching hour could increase my dps by 10k or more, but then I lose so many resists ( 80 + 60 setbonus ) that I am scared to do that...
Sell your main hand and buy a Sever (850-1000 dps) with a socket. Upgrade your OH gem and use it as MH.
Buy another piece of IK gear for the 3set bonus. 15% melee damage reduction is alot.
Mp4 should be a joke.
By using Sever you will gain 150+ vit, 20-25% damage to demons (ACT3 is full of demons and 25% is alot), 1% crit, more attack speed on your offhand (faster tornado ticks from Sprint) and the proc.
With just 6% life steal (3 from belt and 3 from passive) that proc can heal you to full hp.
I had a Sever since the start of 1.0.4 and it carried me to plvl 100. I could farm keys on MP10 without dieing and not caring what affixes the elites had or how many packs there were. All I had to do on higher MPs was pull the elites in a pack of mobs and WW the shit out of them. Clever use of game mechanics no?
You can always buy the cheapest Sever in the AH and check the proc out.
If you feel it's not worth it, then well, don't use it.
Edit: You don't loose attack speed. That 11% IAS on you MH do not carry on your OH. Only Echoing Fury can do that.
Swords have 1.4 base attack speed.
For keyfarming on higher monster power I would suggest to get a cheap skorn and using another build.
Cleave + Rend (If you are interested in this way, you can find a guide on my blog.)
In EU you can get a Skorn with more then 300 Str, 180 critical damage below 1 mio with 1.100 - 1.190 dps.
If you are more interested in run lower monster power with your current skills, then first I would get another mainhand weapon with a socket and minimum 60 critical damage. For 5-8 mio you will get a mace or axe with 950-980 dps.
give it a try. I hope you will be surprised. If you want, we can also play together with the same skills.
I am not a big fan of your rend build. It lacks mobility IMO. Once you are surroundet by mobs, there is no way out. I would use charge or leap or whirlwind or anything that lets you move trough mobs, or i would use HotA to push them back.
I found that charge works very well, specialy with the rune that resets the CD if you hit enugh mobs. You can basicaly rend - charge - rend - charge etc.
All in all, your build does not realy increase survivability for me much. I can easily do mp6 with the ww/sprint build, and when i try your build on mp8, i take too much damage once i am surroundet. Maybe I will try rend / hota next.