The cost for parts sounds right in line with what I paid.
I would go ahead and have them do it.....
This is a repair that you should not have to do again, as the new gaskets have been improved to adress the weakness that causes them to fail.
I would have the repair done ASAP as coolant into the motor oil will cause more serious repairs.
The job calls for a oil and oil filter change before starting the engine.
The upper intake manifold gaskets are reusable.
Also....ask them to clean out the EGR ports, which are located in the lower intake manifold.
Maybe even replace the cross over tube....a metal line that goes from the passenger side of the motor over to the driver side.....the coolant to the heater hose passes through it.
The cross over (aka bypass hose) includes the "U" shaped hose that connects between the fitting from the water pump....and the end of the cross over pipe.
These 2 extra items are easy to do as they have the lower intake manifold off anyhow.