If I'm going to replace the water pump at some point in the 85k to 95k miles range what else does it make sense to change or grease (serviceable bearings or bushings on pulleys?) at the same time? Serpentine belt? If belt, OEM or is there a better aftermarket? Tensioner? Idler pulley? Thermostat? Hoses? What else is relatively likely to fail at <150k?

 

Well the big one is to do like the 100k mile tune up. And if you are going to get in depth you might as well.

If changing the water pump I would without a doubt just change the thermostat and the belt. I would use all OEM parts too as they are undoubtedly the best.

 

nothing really does a better job than oem if the car is mostly oem. check plugs, and while at it you can also check the screen behind the idler/ps pulley to see if it has anything in it and clean it. other than that man these motors don't require too much attention.

 

SEARCH is your friend.... ;-)

https://honda-tech.com/forums/acura-integra-type-r-8/faq-acura-recommended-maintenance-schedule-217861/

(can also be found in your owner's manual)