Here's another vote for replacing the water pump and tensioner at the same time. On a lot of cars, the additional work to replace the water pump is literally something like "remove three bolts and remove the water pump, bolt new water pump on" right in the middle of the work, after taking off the timing belt covers, right front wheel, accessory belts, the crankshaft bolt, crankshaft pulley, more timing belt covers, timing belt tensioner, and timing belt.
Unless you're seeing leaks, I wouldn't worry about replacing the seals.