I've just done mine, only mine is on its 3rd having covered over 150K now. I did change the water pump, it was only £20 and they do advise you to change it if the vehicle has covered 100K or more.
I bought the whole kit: timing belt, tensioner, 2 rollers and and idle pulley. GSF sold the kit for £100. My kit is expensive as it is the AHF engine, I suspect yours will be cheaper.