Hi welcome to Just Answer.
This price you have been quoted is very good considering the job time on this is 8.2 hours .
You need to make sure that a pressure test and reface on the head is inclusive of this price as this is most important to do.
the is 200 is a very reliable car and would say that it is worth doing but also it is dependant upon the mileage and condition .
if you need anymore help on this feel free to ask.