2004 Audi A4 Timing Belt/Water Pump?

I need to get my timing belt replaced on my 1.8T and they said that while I'm doing my timing belt, I might as well do my water pump and then it turned into timing belt, water pump, hydraulic tensioner, "rollers"?, and drive belt for $807.07. They hadn't look at my car, I just talked to them over the phone so is all of that necessary? or are they just trying to play me? If so, which all should I do? Thanks!