timing belt + water pump repair cost

What is your question?

Hi, I have a Hyundai Santa Fe 2005 (3.5 GLS V6). It's milage is close to 120K. I guess I need to change the Timing belt. However, when I am approaching the repair shops for the same, they are insisting that I should also change the water pump. So after reading some of the online forums (which confirms what the shop told me) I gather that it is better to change the water pump. However, they are charging me somewhat in the vicinity of $1200 for both. But online I saw the the parts cost around $160 (for timing belt) and $60 for water pump, and the labor costs max $600 (approx). So together it should cost me not more than $900. But then why are they charging $1200 (approx) ? I live in Pittsburgh, PA. Any suggestions/opinions would be greatly appreciated. Thanks