Finished Hell yesterday on my Wizard.
I actually had a lot of issues on Nightmare Diablo and then I switched my itemization and Hell Diablo was cake.
I finally got my first legendary drop a couple hours after beating hell...
I'm running around with 29k hp, 8.5k dps and 40-45% resists right now and Hell is becoming easier ( I went resists/armor over dps as I use a shield over a Wizard source).
Right now I am gathering the materials for the Staff of Herding and I am planning to visit Wimsyshire on Hell difficulty..