How do I replace the front brake rotors?

[Ldub]

What are the benefits repacking bearings when swapping rotors; is it better to replace those also?

All lubricants break down with time/use.
Examine the bearings upon disassembly/cleaning, if there is any sign of scorching (brown-almost black discoloration on the rollers), they should be replaced.(I found new @ Auto Zone)
Some replace bearings every time they are due for repacking (every 30-40k), because they aren't THAT expensive, & since you already have it all apart anyway, why not.
Any bearing that is replaced, should also have a new race, the part that the bearing contacts inside the hub, all new bearings come with a new race.

Always replace the seals.