In my shop I evaluate the water pump on an individual basis, some of them go a real long time and I have yet to see or hear of one taking out the timing belt when it goes, this is not to say that it cannot happen. However, I do recommend changing out the tensioner and idler pullies as well as the tensioner itself at every other belt change. From what you said, this is the third belt going into the car, if you have not changed these components then I would recommend that you do. By recommending that you replace any of these components prophalacticaly what is being said is that the parts you are replacing have already lasted "X" amount of miles, in your case 176K or so, and you are expecting them to go another 70K until you are in there again. If you are doing your own work and do not mind do it over again to change out a component that did not make it to the next interval then you can save some money, I guess, but if something gives it up while you are driving then you are screwed. The other school of thought is that by being proactive and changeing this stuff out ahead of time you can budget your time and money for these repairs instead of having them just spring up at the worst possible time and place.

Mark