I just replaced my waterpump as a preventative measure when I did my timing belt at 203k. I felt very uneasy that I had left it go this long. There was a bit of residue of antifreeze on it, but it spun very freely. While I was in there, I also replaced the tensioner pulley, and the stationary idler pulley. (You could hear the bearings, and there was some slop) The hyaudralic tensioner piston was replaced at 140k, seemed quite fine (took forever to comress it, no oil residue) so I didn't replace that. Just do the math. If anything in the timing belt area fails, you're talking bent valves, maybe more, and $$$$$$. When you take into account how often American car water pumps fail, I have even less reservations about replacing it as a preventative measure.

Jason