The timing belt can *probably* wait until 105K, maybe to 120K; however, if it breaks before, it could damage the engine. The 3.3L V6 is an interference design. As for the plugs, they are good for at least 100K. You just save some labor cost if you have them done at the same time.
The water pump is another one of those, can it make it to 200K for your next belt change? If it isn't replaced now and it fails at say, 150K, the engine could be damaged. So, you don't have to replace the water pump, it is just recommended because replacing the water pump is cheap insurance.
Also, if you are going to the dealer, I would strongly recommend looking elsewhere. I use an independent that specializes in Toyota/Lexus and the cost was about $700 for the timing belt, water pump, Iridium spark plugs, coolant exchange and serpentine belt. My quote from Lexus was about $1600 for the same package.