Some other things to consider...
take note of their hourly rate.
look for quality level of shop. Some have to send parts out to have bearings pressed on or off cause they don't have the equipment.
ask them if they have the proper tools and skill set for adjusting the backlash.
inspect the parts before you hand them off. nothing sucks worse than having a ring with a defect installed, only to have to pay the hourly rate to have it removed and a new one put in, with the added expense of new seals.
Mine was about $400 at the dealership, and that was just labor (but my car was still under warranty and the parts were genuine Ford, so the warranty was not void with the mods made)