Preventive Maintenance & 90k Service

[Lexus Luddite]

I obviously have a low mileage RX300 since it's a 2003. I'm the second owner having bought it certified from a Lexus dealership back in 2006.

I recently moved and found an independent shop with fantastic reviews that specializes in Japanese cars. They've quoted $950 for the 90k service including changing the timing belt.

I'm definitely doing the timing belt because mine is 5 or 6 years older than most who were doing their 90k service on this forum. I don't want to risk major engine damage and the car is still in great shape. Aside from regular oil checks (use synthetic oil BTW), my only maintenance costs in nearly 10 years have been exhaust related, ball joints & sway bars, tires, brake pads and a battery. Not sure if it's been a major contributing factor but I'm someone who lets the engine warm up in every season - especially winter - so maybe that's helped reduce engine damage.

My question is if I plan to keep the car for another several years should I replace the water pump and thermostat too as a preventative measure and since my car is 12 years old and I probably wont put more than 5 to 8k miles on the car per year. Are there other items you would consider too?