I spent ~2M on tank gear so that I can clear any elite pack in act 2 and can run from elite pack to elite pack in act 1 while ignoring minion and weaker mob damage for faster farming of rares.

Ended up with 6k armor, 600 all resists, 800 life on hit 27k hp, 900 dex and 8000 dps using stun grenades/fear skull/damage traps/healing prep/DR turret/shuriken cloud.

I'm one of those players that likes to kill everything in a map though. You could probably do it with all dex or dex/AS blues in every slot and a decent blue dps bow if you want to avoid a lot of mobs.

http://i48.tinypic.com/2ut59w7.jpg < My Scoundrel has my dps gear...check him out!
http://oi50.tinypic.com/fy3mkk.jpg
http://oi49.tinypic.com/2jdnlnp.jpg

I just got a 700k gold blue drop...amidst tons of great yellows...so access to the higher item levels here pays for the tank gear...(which you can resell if you need so I guess it doesn't cost anything)...in about 4 hours.

Normal mob groups die in 10-15 seconds and elite groups take 30 sec-1 minute. Face tank ftw. I don't even use potions in Act 1 Inferno, and just face tank Butcher.

Edited...my Scoundrel didn't look nearly as cool as he does now!

Link in prior post has what I used to face tank Belial Act 2 (and Butcher Act 1) with about a half dozen minions at the same time.

I just face tank pretty much everything, reflect damage mobs...bosses...a dozen deceivers...whatever...I like the nice ring of bodies that it leaves.

http://i47.tinypic.com/2dkgtht.jpg

http://i45.tinypic.com/34oq25s.jpg

http://i45.tinypic.com/35hr884.jpg < What I like to see!

Act III...I've done/tanked parts of Act III, I can face tank unlimited melee guys in the start...some ranged and elite affixes are worse than others. It is different than Barb tankyness. I also play with a barb friend all the time...I'm tankier than he is by far against consistent damage (I just sit in molten/plague/desecration while he dies) but he lives through burst (arcane + fire explosions) better due to cooldowns/mobility. This is primarily due to skill choices since I don't use any mobility or burst reduction skills.

http://i46.tinypic.com/28rll49.jpg

The honest truth is that DH have adequate tanking mechanics...people said wait till Inferno where you will be 2 shot, and I face tank butcher now, then they said wait till Act II, and now I face tank Act II...then they said wait till Act III, and now I face tank the start of Act III that I am in...