Whirlwind Barbarian Build / Spec Guide by Kripparian.
Screenshot of gear: http://img42.imageshack.us/img42/7476/krippergears.png
1.0.8+ Updates and Edits:
HP you should aim for: 40k HP is a good number to aim for.
WotB not staying up? Try playing with a higher Monster Power. When enemies die too fast, your Thrive on Chaos won't be able to generate enough Fury for WotB to stay up, so try something like Monster Power 3 - 5 if you can handle it. I find with about 150-200k dps, MP 5-6, I have no problems staying in Wrath throughout zones, and it's always ready to go again if it does go down.
Also something I used to do is try switching out a passive for Boon of Bul-Kathos. Since Wrath is the main key to this build, always having it ready really helps out. There will be times when you are stuck without wrath and you get a really nasty combo, with this rune, most of the time, you won't find yourself in that situation.
Check out Maintaining WotB Minimum Requirements if you need more tips.
Note 2 for passives: If you do enough DPS (above like 90k) bloodthirst would be a great passive to pick up instead of Nerves of Steel. Bloodthirst works very well with this build because each tick of your tornados heals you. With life steal from a cheap Immortal Kings belt and this passive, you can stay alive
Extra DPS and a useful attack: Once both your Resistances and Armor are high enough with your gear (about 400-500 res, and 5.5k armor), try dropping Warcry for Hammer of the Ancients - Smash. This ability is very useful in many situations. For example when you encounter mobs that keep running away, Hammer of the Ancients will take care of them a lot faster than trying to create tornados around them. Also mobs that jail you when WOTB isn't up aren't a problem any more because if you are close enough to them (which you should be most of the time) HOTA will take care of them easily.
To learn more about HotA builds, check out the HotA Builds, Guides & Videos page.
Check out these other useful WW Barb guides on the site as well: