The same amount of labor is required later if you do have to change the
water pump.  Something to think about.

The vehicle has just over (barely) 60,000 miles on it... I intend to
replace the external drive belt as well, because of it's age if
nothing else.  The same goes for the rad. & heater hoses...  I figure
that this is going to be a lot of labor anyway, so I might as well put
new "service"  parts on after having to remove the old parts to get to
the *bleeping* timing belt.  Are the water pumps very expensive?  what
about the timing belt pulleys? (In other words, are they inexpensive
enough to just warrant replacement to save the possible nightmare of
having one fail?)

me