Need some advice regarding engine swap

Hey everyone,I might be replacing my engine soon. I'm hoping you guys could give me some advice.

I'm wondering what parts do you recommend I change?

For sure:
-timing belt
-water pump
-spark plugs

But what else do you guys recommend that I change while the engine is pulled out and I can get something changed for free or at little-to-no cost?

Also, if you recommend a part, should I go with an OEM or a name brand aftermarket (for example, I'll be using the Aisin timing belt and water pump kit)?

Thanks in advance.