I'm going to change timing belt along with drive belts and termostat. Is it really recommended to change water pump and tensioner? Anything else?

 

yeah, since its a PITA to remove all the stuff to get to the timing belt which is the same stuff you have to remove to change the h20 pump. Go ahead and do it all while your in there and do the preventative maintenance. Might as well change out radiator hoses too. You could also put in an underdrive pully, since you have to take the orignal off, just replace it with a new lighter and smaller diamter one.

 

I'd really recommend the tensioner and the water pump.