For crusader I'm 650k sheet dps, 13m toughness - but I'm using schaefer's hammer which is additional 200% aoe damage every second around me, so my dps is probably a lot higher(also got 15% lightning dmg on bracer thats not seen on dmg sheet).
I'm farming T2 really comfortably... walk around and trash mobs melt in 2-3 seconds. I can farm T3 too but it's 2x/3x as slow and if an elite has weird affixes with walling it becomes a really hard fight.
I'd say 300k dps with 7m toughness was when I could efficiently farm T1. Like actually farm, not just sit and wait on cooldowns or kite for ages.
Wizard - Over 500K DPS and 2.2m toughness unbuffed. However T1 is not even a challenge for me because after buffs plus stacking over 30% meteor damage plus lightning damage I deal 7-8m damage per meteor.
Sheet DPS is only scratching the surface, eDPS is the true indicator. Just sucks there's no good calculator for eDPS atm until D3UP updates to RoS.
I pretend to leave and then......SURPRISE ATTACK!!!!