When changing timing belt.....do I need to change anything else or should I just change the timing belt???? (i.e. Water Pump, Tensioner, Balance Shaft Tensioner)

 

Do it all. The labor to get the water pump changed is basically the same as the labor to do the Timing Belt. The waterpump is a $60 part, the general view is you might as well do it while your in there doing the belt anyway.

I just had my belt done at 65k and I also had the autotensioner done, the balancer shaft belt, the water pump and the valve seals all done at the same time.

 

honda OEM pumps run around the 90$ range

 

also change the cam and crank seals, they tend to leak after 100,000 miles.