Buy an OEM kit on Ebay from an online OEM dealer. The kit should include the timing belt, alternator-a/c belt, PS belt, water pump, valve cover gasket and spark plug tube gaskets. There is one on Ebay now for $120 total. If you want, compare the price to buying each part individually via www.bkhondaparts.com
I am frugal and do not always go OEM, but in my experience, OEM for these parts will pay for itself in longevity and peace of mind.
I do not change the tensioner on the first TB change.