Been using this throughout hell and now into inferno; basically with those abilities (first one is preference based, use whatever main attacking ability you want) you can use blizzard to kite and venom hydra for constant damage.
The rest of them are pretty dependent on NO vitality gear, and instead health regeneration gear. Why? Because with the 35% damage cap, and over 1k health regeneration you'll heal faster than most enemies can do damage to you (which is capped at around 1.5k) Your only real threat is being surrounded or fast attacking enemies, and with illusionist, when fighting most enemies in hell/inferno you'll always be able to teleport the second you get hit if needed.
Diamond skin, when combined with the Force Armor and low health basically becomes 6 seconds of complete invulnerability since the chances of you taking that 20k damage are extremely low.
So for gear, basically make sure there's no vitality on it and that there is health regeneration, otherwise you can just go intellect/other damage bonuses, or even dexterity for a high dodge chance making you even harder to kill.
And for a fun note: I had an elite mob enrage on me in inferno difficulty (I hopped right into it without getting any good gear) and it still wasn't capable of killing me when I was just attacking it head on.