Your best advice would probably be from one of the Honda specific forums as I'm not familiar with that particular motor. But typically, I can tell you that on similar models of front wheel drive autos, now is a good time to replace the water pump and other components.
You mentioned that you have a mechanic you will use. Why not listen to his advice on what else you might need? Also, the practice of you buying the parts and the mechanic installing them can come back to bite you; the mechanic then only has to guarantee his labor, not the parts. If a part fails, you're on your own. If the mechanic supplies the parts AND labor, he guarantees both. JMHO and I don't see much savings in supplying your own parts in the long run.