Replace the water pump?

[sfsvx]

I'm about to have the engine front end work done - cam and crank seals, timing belt - and I'm wondering if I should go ahead and replace the water pump.

It's a '92 with 106K miles on it. The timing belt was replaced at 60K, but I figured it's not that expensive to replace it now and not have to tear the front end apart in another 15K.

How long do SVX water pumps normally last? Would it be prudent to replace the darn thing while it's open, or is it likely to last another 100K?

Thanks in advance.