Get the Hane's manual mate. Nobody will be able to answer your question without know the actual model.
You might not even have a timing belt, but rather a timing chain. In which case, you won't even have a tensioner. Even then, some cars have a timing belt, but no tensioner.
$1000 for the timing belt/water pump/crank seals/cam seals/etc., etc., is okay. I've seen some people drop $1500 on that job.
You can call around to car customizing places and they can usually order parts in for you, but then you'd have to find a mechanic that would do it for you.
I called Honda and they said that they'd charge in the neighborhood of $800 to $900 to do my timing belt, but their prices for parts were retarded. I called around to the rice shops around town and was able to get the parts for 30-40% less, however, Honda won't guarantee their work if it's not their parts -and in which case, they outright refused to put it in the car for you.
I'm sure if I found another mechanic to do it, it wouldn't be a problem.
Ask some friends to borrow their garage for a bit. It'd be pretty cheap to get that all done at once cause since they have to take out the engine to get to them cam/crank seals, the clutch is easy to get to so it'd be cheaper than doing both at two different times.
To answer your question: It would be best to replace your tensioner (if you had one) cause since you're already in there, you might as well do it. Just like the water pump. If the water pump went and you just paid to replace the timing belt, you'd have to dismantle the exact same parts to access the pump. Plus, the life expectancies are roughly the same. That's why you're supposed to hit everything at once. Spending the extra $300 on parts can save you thousands in labour.