You can get +114~116 Crit Chance with:

Uldah Cudgel
Sorc Robes
Warlock Satchel Belt
Mages Choker
Black Pearl Rings +1

Afaik from last patch that should be 10% Crit chance on Lv.50 mobs, less on bosses. Would have to do some testing but not sure that would be an optimal build for max DPS on bosses. INT + Crit Pot. boosted would probably be better.