Biggest reason to switch to big pulleys is that you can use the db01 reinforced drive belts. They are much, much better than standard ones. Lasts forever or at least longer than the pulleys.
Other than that, use hard hex ball studs (or similar)
Grey ball cups (or similar).
Replace the turnbuckles with blue titanium (or similar).
Use Ceramic diff balls.
Put a bit of sponge on top of diff screw to protect thrust bearing from dust.